04 gases Premium VersionBy Bomvirtual.com / June 8, 2025 0% 0 votes, 0 avg 34 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980 Created by Bomvirtual.com 04 gases Premium Version 1 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 1) According to kinetic theory of gases: A) There are intermolecular attractions B) No intermolecular attractions C) The velocity of molecules decreases after each collision D) Molecules have considerable volume According to kinetic theory of gases, No intermolecular attractions 2 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Plasma 2) In intense electrical fields and at a very high temperature, the matter generally exists in: (FMDC 2017) A) Liquid state B) Solid state C) Plasma state D) Super condensed state Plasma is the fourth state of matter, where atoms lose electrons due to high temperature or strong electric fields, creating a mixture of ions and free electrons. 3 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 3) According to kinetic theory of gases, for a diatomic molecule: A) The pressure exerted by the gas is proportional to the root mean square velocity of the molecules B) The mean translational kinetic energy of the molecules is proportional to the absolute temperature C) The pressure exerted by the gas is proportional to the mean velocity of the molecules D) The root mean square velocity is inversely proportional to the temperature According to kinetic theory of gases, for a diatomic molecule The mean translational kinetic energy of the molecules is proportional to the absolute temperature. All molecules of an ideal gas show random motion. They collide with each other and walls of container during which they lose or gain energy so they may not have same kinetic energy always. 4 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Dalton’s law 4) Dalton’s law of partial pressure will not apply to which of the following mixture of gases A) CO₂ and Cl₂ B) H₂ and SO₂ C) H₂ and CO₂ D) H₂ and Cl₂ H2 & Cl2 gases may react with each other to produce HCl gas hence Dalton’s law is not applicable. 5 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 5) Containers A and B have same gases. Pressure, volume and temperature of A are all twice that of B, then the ratio of number of molecules of A and B are A) 1:04 B) 1:02 C) 4 D) 2 6 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 6) Select one correct statement. In the gas equation, PV = nRT A) V denotes volume of one mole of the gas B) n is the number of molecules of a gas C) n moles of the gas have a volume V D) P is the pressure of the gas when only one mole of gas is present PV = nRT, n moles of the gas have a volume V 7 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 7) Consider an equation: N₂ + O₂ → 2NO. The partial pressure (in atm) of N₂ under normal atmospheric pressure is: (ETEA 2006) A) 0.35 B) 0.25 C) 0.05 D) 0.45 P = XP0 (n = 2 moles), P0 = Total Pressure=1atm, X = Mole fraction =(Moles of Comp)/(Total Moles in Mix)=1/2=0.5 , P = X P0 = 0.5 × 1 = 0.5 atm , Partial Pressure of N2= 0.45 8 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 8) Which property of a gas affects the rate at which it spreads throughout a laboratory? (NUMS 2013) A) Boiling point B) Solubility in water C) Reactivity D) Molecular mass According to Graham’s Law, lighter gases diffuse faster, so molecular mass directly affects the rate of diffusion. 9 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MMOLECULAT THEORY 9) The internal energy of fixed cases of an ideal gas depends on: (ETEA 2013) A) Pressure and temperature, but not volume B) Volume, but not pressure or temperature C) Temperature, but not pressure or volume D) Pressure, but not volume or temperature U α T According to the kinetic theory of gases, the internal energy of an ideal gas is solely dependent on temperature. It is given by U=3/2nRT for a monatomic gas, where n is the number of moles and T is the temperature. Pressure and volume do not directly affect internal energy in an ideal gas. 10 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 10) Postulate of kinetic theory is: A) Atom is indivisible B) There is no influence of gravity on the molecules of a gas C) Gases combine in a simple ratio D) None of the above The kinetic molecular theory of gases assumes that gas molecules are in constant random motion, and their behavior is governed by elastic collisions and negligible intermolecular forces. One of its postulates states that the effect of gravity on gas molecules is negligible because their movement is primarily due to kinetic energy rather than gravitational forces. 11 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 11) At the same temperature and pressure, which gas will have the highest kinetic energy per mole? A) Methane B) Oxygen C) All the same D) Hydrogen K.E = 3/2 (RT) . all have same kinetic energy at same temperature. 12 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> BOYLES LAW , CHARLES LAW AND ABSOLUTE ZERO 12) The volume occupied by 3.2g of oxygen gas at S.T.P is: (ETEA – 2023) A) 1.12 dm³ B) 2.24 dm³ C) 24 dm³ D) 22.4 dm³ n = V/M.V → V = n x M.V= (m/M)xV = 3.32/32 x 22.4 = 2.24 dm3 13 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 13) Which of the following shows marked deviation from ideal behavior at a given temperature and pressure ETEA – 2022 A) H₂ B) CO₂ C) He D) N₂ Ideal gas behavior assumes no intermolecular forces and that the volume of the gas particles is negligible. Deviations occur due to intermolecular attractions or because the particle volume is not negligible. CO2 shows more deviation from ideal behavior at a given temperature and pressure compared to He, N2, and H2 because it has stronger intermolecular forces (van der Waals forces) than the other gases, especially at temperatures and pressures where CO2 can liquefy or solidify. 14 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> REAL GASES AND VAN DER WAALS EQUATION 14) The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called A) Critical temperature B) Inversion temperature C) Boyle temperature D) Reduced temperature The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called Boyle temperature 15 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Liquefaction of Gases 15) Which set of conditions represents easiest way to liquefy a gas? A) High temperature and low pressure B) Low temperature and high pressure C) High temperature and high pressure D) Low temperature and low pressure Low temperature and high pressure represents easiest way to liquefy a gas. 16 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Plasma 16) Plasma When an electric current is passed through neon gas, it produces: (ETEA 2018) A) Plasma B) Both plasma and light C) Plasma, light, sound D) Light Neon gas ionizes under electric current, forming a plasma, which emits light due to excited electrons returning to lower energy levels. 17 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 17) 16 g of oxygen and 3 g of hydrogen are mixed and kept at 760 mm pressure and 0°C. The total volume occupied by the mixture will be nearly A) 44800 ml B) 448 litres C) 33.6 litres D) 22.4 litres 18 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 18) Helium atom is two times heavier than a hydrogen molecule. At 298K, the average kinetic energy of helium is: A) Same as that of a hydrogen molecule B) Four times that of a hydrogen molecule C) Two times that of a hydrogen molecule D) Half that of a hydrogen molecule Helium atom is two times heavier than a hydrogen molecule at 298K, the average kinetic energy of helium is Same as that of a hydrogen molecule because both are at same temperature. E α √T 19 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 19) Which gas deviates most from ideal behavior at room temperature and pressure? ETEA 2005 A) Nitrogen B) Hydrogen C) Methane D) Sulphur dioxide Deviation ∝ Polarity, CS2 → polar , Hydrogen (H2) → London dispersion forces (weakest), Nitrogen (N2) → London dispersion forces (weakest), Methane (CH4)→ London dispersion forces , Sulfur dioxide (SO2)→ Dipole-dipole interactions and London dispersion forces (strongest) 20 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 20) At N.T.P. the volume of a gas is found to be 273 ml. What will be the volume of this gas at 600 mm Hg and 273°C A) 691.6 ml B) 750 ml C) 380 ml D) 391.8 mL 21 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 21) Which of the following is valid at absolute zero? A) Kinetic energy of the gas becomes zero but the molecular motion does not become zero B) Kinetic energy of the gas becomes zero and molecular motion also becomes zero C) None of the above D) Kinetic energy of the gas decreases but does not become zero AT absolute zero, Kinetic energy of the gas becomes zero and molecular motion also becomes zero. 22 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 22) Molecular weight of a gas that diffuses twice as rapidly as the gas with molecular weight 64 is A) 16 B) 6.4 C) 8 D) 64 23 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 23) If 4 g of oxygen diffuse through a very narrow hole, how much hydrogen would have diffused under identical conditions? A) 64 g B) 1/4 g C) 1 g D) 16 g Graham law. 24 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Liquefaction of Gases 24) If a gas expands suddenly then its (KMU-CAT 2023) A) Temperature decreases B) Pressure decreases C) Pressure and temperature both decrease D) None of the above Sudden expansion → Adiabatic process (no heat exchange). Work is done by the gas, reducing internal energy → Temperature drops (Joule-Thomson effect). Pressure also decreases, but the primary effect is cooling 25 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> BOYLES LAW , CHARLES LAW AND ABSOLUTE ZERO 25) At what temperature both Fahrenheit and Celsius scales coincide? (ETEA 2010) A) -40°C B) 32°C C) -30°C D) 40°C °F = (°C * 9/5) + 32→°x – (°x * 9/5) = 32 →-4/5 * °x = 32 →°x = -32 * 5/4 →x = -40° 26 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> BOYLES LAW , CHARLES LAW AND ABSOLUTE ZERO 26) A graph between volume and temperature gives a straight line which cuts the temperature axis at NUMS 2020 A) 0°C B) -273°C C) 273°C D) 546°C The absolute zero temperature is -273°C (or 0K), at which the volume of an ideal gas theoretically becomes zero. This is the extrapolated intercept of a Volume vs. Temperature graph, according to Charles’ Law. 27 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> REAL GASES AND VAN DER WAALS EQUATION 27) A gas is said to behave like an ideal gas when the relation PV/T = constant. When do you expect a real gas to behave like an ideal gas? A) When temperature is high and pressure is low B) When both temperature and pressure are low C) When both temperature and pressure are high D) When the temperature is low A gas is said to behave like an ideal gas when the relation PV / T = constant .A real gas to behave like an ideal gas When the temperature is high and pressure is low. 28 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 28) The equation used to describe the behavior of ideal gases under standard conditions; ETEA 2018 A) PM=dRT B) PVM=mRT C) All of the above D) PV=nRT All three equations, PV = nRT, PM=dRT, and PVM=mRT, are variations of the ideal gas law used in different contexts. 29 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 29) Which statement is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas? A) The fraction of the molecules with the most probable speed increases B) The area under the distribution curve remains the same as under the lower temperature C) The distribution becomes broader D) The most probable speed increases Most probable velocity increase and fraction of molecule possessing most probable velocity decrease. 30 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Avogadro’s law 30) Equal volume of different gases under same condition of temperature and pressure contain the same number of particles. The above statement is of: ETEA 2014 A) Graham’s Law B) Avogadro’s law C) Dalton’s law D) Hund’s rule Avogadro’s Law states that at constant temperature and pressure, equal volumes of all gases contain the same number of molecules. This explains why 1 mole of any ideal gas occupies 22.4 L at STP. 31 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> BOYLES LAW , CHARLES LAW AND ABSOLUTE ZERO 31) Which thermodynamic temperature is equivalent to 501.85°C? ETEA 2013 A) 228.70 K B) 228.85 K C) 774.85 K D) 775.00 K = C0 + 273.15 →K = 501.85 C0 + 273.15 = 775.00K 32 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 32) The rate of diffusion of methane at a given temperature is twice that of X. The molecular weight of X is A) 80 B) 40 C) 64 D) 32 33 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 33) The average K.E. of an ideal gas in calories per mole is approximately equal to: A) 1.5 times the absolute temperature B) Absolute temperature C) Three times the absolute temperature D) Two times the absolute temperature K.E = 3/2 (RT) = 3/2 (2 cal/Kmol T) = 3T 34 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Liquefaction of Gases 34) Adiabatic demagnetisation is a technique used for A) Production of low temperature B) Adiabatic expansion of a gas C) Production of high temperature D) None Adiabatic demagnetisation is a technique used for Production of low temperature 35 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Liquefaction of Gases 35) An ideal gas can’t be liquefied because A) Its molecules are relatively smaller in size B) Forces operative between its molecules are negligible C) Its critical temperature is always above 0°C D) It solidifies before becoming a liquid An ideal gas can’t be liquefied because Forces operative between its molecules are negligible 36 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Dalton’s law 36) If three unreactive gases having partial pressures Pₐ, Pᵦ, and P꜀ and their moles are 1, 2, and 3 respectively, then their total pressure will be A) P = (Pₐ + Pᵦ + P꜀)/6 B) P = Pₐ + Pᵦ + P꜀ C) P = (Pₐ + Pᵦ + P꜀)/4 D) None If three unreactive gases having partial pressures PA, PB and PC and their moles are 1, 2 and 3 respectively then their total pressure will be P = PA +PB + PC 37 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 37) An unknown gas diffuses 5 times slower than that of H₂. The molecular mass of the unknown gas is: (ETEA 2018) A) 25 B) 10 C) 15 D) 50 38 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 38) Kinetic energy of a gas depends upon its: A) Molecular mass B) Atomic mass C) Equivalent mass D) None of these K.E = 3/2 (RT) = 1.5 RT 39 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Dalton’s law 39) To which of the following gaseous mixtures is Dalton’s law not applicable A) NH₃ + HCl + HBr B) Ne + He + SO₂ C) O₂ + N₂ + CO₂ D) N₂ + H₂ + O₂ NH and HCl & HBr is a reacting gas mixture to produce NH4Cl and NH4Br so Dalton’s law is not applicable. 40 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 40) The molecular weight of a gas which diffuses through a porous plug at 1/6th of the speed of hydrogen under identical conditions is A) 48 B) 72 C) 27 D) 36 41 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 41) A gas diffuses 1/5 times as fast as hydrogen. Its molecular weight is A) 50√2 B) 25√2 C) 50 D) 25 42 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 42) Hydrogen diffuses six times faster than gas A. The molar mass of gas A is A) 72 B) 24 C) 6 D) 36 rA/rB = √(MH/MA ) → r/6r= √(2/MA ) → MA = 6x6x2=72g 43 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 43) The densities of hydrogen and oxygen are 0.09 and 1.44 g/L. If the rate of diffusion of hydrogen is 1, then that of oxygen in the same units will be A) 16-Jan B) 4 C) ¼ D) 16 44 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Liquefaction of Gases 44) Which of the following is correct for critical temperature? A) It is the highest temperature at which liquid and vapour can coexist B) At critical temperature (T<sub>c</sub>), the surface tension of the system is zero C) Beyond the critical temperature, there is no distinction between the two phases and a gas cannot be liquefied by compression D) All of these Tc is the highest temperature where liquid and vapor can coexist. Beyond Tc, a gas cannot be liquefied by pressure alone. At Tc, the surface tension becomes zero, meaning there is no clear phase boundary between liquid and gas. 45 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 45) The constant R is A) Work done per degree per mole B) Work done per molecule C) Work done per mole D) Work done per degree absolute R = PV/nT = W/nT 46 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> REAL GASES AND VAN DER WAALS EQUATION 46) When is deviation more in the behaviour of a gas from the ideal gas equation PV = nRT? A) At low temperature and high pressure B) At low temperature and low pressure C) At high temperature and low pressure D) At high temperature and high pressure When is deviation more in the behaviour of a gas from the ideal gas equation PV = nRT At low temperature and high pressure. 47 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 47) Correct gas equation is A) (P₁ T₂)/V₁ = (P₂ V₂)/T₂ B) (P₁ V₁)/(P₂ V₂) = T₁/T₂ C) (V₁ V₂)/(T₁ T₂) = P₁ P₂ D) (V₁ T₁)/P₁ = (V₂ T₁)/P₂ (P1 V1)/(P2 V2 )= T1/T2 48 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> REAL GASES AND VAN DER WAALS EQUATION 48) Any gas shows maximum deviation from ideal gas at A) 0°C and 1 atm pressure B) 50°C and 1 atm pressure C) -100°C and 5 atm pressure D) 100°C and 2 atm pressure A gas shows maximum deviation from ideal behavior under high pressure and low temperature because: 1. At low temperatures (-100°C): The kinetic energy of molecules decreases, making intermolecular forces more significant. This causes the gas to deviate from ideality, as ideal gases assume no intermolecular forces. 2. At high pressure (5 atm): The gas molecules are forced closer together, making the finite volume of gas particles significant, which violates the assumption of ideal gases that gas molecules occupy no volume. Among the given choices, -100°C and 5 atm provides the most extreme conditions for deviation. 49 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Avogadro’s law 49) “One gram molecule of a gas at N.T.P. occupies 22.4 litres.” This fact was derived from A) Law of gaseous volume B) Berzelius hypothesis C) Dalton’s theory D) Avogadro’s hypothesis “One gram molecule of a gas at N.T.P. occupies 22.4 litres.” This fact was derived from Avogadro’s hypothesis 50 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 50) A gas diffuses ½ times as fast as hydrogen gas. Its molecular mass is: (ETEA 2016) A) 25 a.m.u B) 32 a.m.u C) 8 a.m.u D) 16 a.m.u ½ = √(M/2) → M = 32 51 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 51) Two grams of hydrogen diffuse from a container in 10 minutes. How many grams of oxygen would diffuse through the same container in the same time under similar conditions? A) 4 g B) 6 g C) 8 g D) 0.5 g 52 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MMOLECULAT THEORY 52) The maximum distance between the molecule of gases can be _______: (NUMS 2019) A) Infinite B) None of these C) Zero D) 100 cm Gas molecules are free to move and spread indefinitely in an unconfined space. According to the kinetic molecular theory, there is no upper limit to the distance between gas molecules in an open system, meaning it can be infinite. 53 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 53) The correct value of the gas constant R is close to A) 0.082 litre-atmosphere K B) 0.082 litre-atmosphere K⁻¹ mol⁻¹ C) 0.082 litre-atmosphere⁻¹ K mole⁻¹ D) 0.082 litre atmosphere⁻¹ K mol The correct value of the gas constant R is close to ) 0.082 litre-atmosphere K-1 mol-1 54 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 54) Which of the following gas will have highest rate of diffusion? A) O₂ B) N₂ C) CO₂ D) NH₃ Rate of diffusion of a gas is Inversely proportional to the square root of its molecular mass. Molecular weights: NH3 → 17, CO2 → 44, N2 → 28, O2 → 32 55 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 55) According to kinetic theory of gases, the energy per mole of a gas is equal to: A) 1.5 RT B) RT C) 0.5 RT D) 2.5 RT According to kinetic theory of gases, the energy per mole of a gas is equal to 1.5 RT 56 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 56) Pure hydrogen sulphide is stored in a tank of 100 litre capacity at 20°C and 2 atm pressure. The mass of the gas will be A) 340 g B) 28.24 g C) 282.4 g D) 34 g PV = nRT → PV = mRT/M→ m = PVM/RT = 34 x 2 x 100/0.082 x 293 = 282.4 g. 57 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 57) The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on: A) Pressure of the gas B) Pressure, volume, and temperature of the gas C) Volume of the gas D) Temperature of the gas The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on Temperature of the gas. K.E = 3/2 (RT) 58 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 58) Absolute zero is defined as the temperature: A) At which liquid helium boils B) At which ether boils C) At which all molecular motion ceases D) All of the above Absolute zero is defined as the temperature At which all molecular motion ceases. 59 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 59) Van Der Waal constant ‘a’ depends on the intermolecular force among gas molecules comparing the following gases which one will have highest value for ‘a’ KMU-CAT 2023 A) N₂ B) H₂ C) CH₄ D) He ‘a’ measures intermolecular attraction: Larger for molecules with stronger forces. CH₄ (methane) has greater London dispersion forces than N₂, H₂, or He due to its larger electron cloud. 60 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 60) Two separate bulbs contain ideal gases A and B. The density of gas A is twice that of gas B. The molecular mass of A is half that of gas B. The two gases are at the same temperature. The ratio of the pressure of A to that of gas B is A) 4-Jan B) ½ C) 4 D) 2 61 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> REAL GASES AND VAN DER WAALS EQUATION 61) Van der Waals equation of state is obeyed by real gases. For *n* moles of a real gas, the expression will be A) (P + na/V²)(nV – b) = nRT B) (P + (n²a)/V²)(V – nb) = nRT C) (P + a/V²)(V – b) = nRT D) (P/n + na/V²)(V/(n – b)) = RT (P +(n2 a)/V2 )(V-nb)= n R T 62 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 62) What is not true for effusion of gases? (NUMS 2020) A) Movement of particles from high pressure to low pressure B) Movement of particles due to collision among themselves C) Movement of particles due to escaping tendency one by one D) Movement of particles through small opening Effusion is the escape of gas particles through a tiny hole without collisions between particles. 63 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 63) The densities of two gases are in the ratio of 1 : 16. The ratio of their rates of diffusion is A) 1:04 B) 4:01 C) 1:16 D) 16:01 64 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 64) Increasing the compressibility of a gas (Z) decreases its ETEA 2023 A) Pressure B) Concentration C) Temperature D) Volume Increasing the compressibility of a gas (Z) Z = PV/nRT 65 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 65) Which one of the following indicates the value of the gas constant R A) 8.3 cal K⁻¹ mol⁻¹ B) 1.987 cal K⁻¹ mol⁻¹ C) 0.0821 lit K⁻¹ mol⁻¹ D) 1.987 Joules K⁻¹ mol⁻¹ R values: a) 8.31 x 107 erg K-1 mol-1 b) 8.31 x 107 dyne cm K-1 mol-1 c) 8.31 J K-1 mol-1 d) 1.987 cal K–1 mol–1 66 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 66) An ideal gas will have maximum density when: A) P = 2 atm, T = 150 K B) P = 0.5 atm, T = 600 K C) P = 1.0 atm, T = 500 K D) P = 1 atm, T = 300 K d = PM/RT, The value of P/T is maximum for P = 2 atm, T= 150 K. 67 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> REAL GASES AND VAN DER WAALS EQUATION 67) The van der Waals equation explains the behaviour of: A) Vapour B) Non-real gases C) Real gases D) Ideal gases The Vander Waal’s equation explains the behaviour of Real gases 68 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 68) In the equation of state of an ideal gas PV = nRT, the value of the universal gas constant would depend only on A) The pressure of the gas B) The units of the measurement C) None of these D) The nature of the gas The value of universal gas constant can be expressed in different units and its value would depend only on the units of the measurement. 69 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Avogadro’s law 69) The value of S.T.P for one mole of any ideal gas is NUMS 2020 A) 0 K & 1 atm B) 273.16°C and 1 atm C) 0°C & 1mm Hg D) 273.16 K and 1 atm Standard Temperature and Pressure (STP) is defined as 0°C (273.16 K) and 1 atm pressure, where 1 mole of an ideal gas occupies 22.4 L. Other options contain incorrect values. 70 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> BOYLES LAW , CHARLES LAW AND ABSOLUTE ZERO 70) Pressure remaining constant, at which temperature volume of gas will become twice to the volume at 0°C? NUMS 2020 A) 200°C B) 273°C C) 546°C D) 546 K V1/T1 = V2/T2 → V1/273= 2 V1/T2 → T2 = 5460K 71 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 71) If two moles of an ideal gas at 546 K occupy a volume of 44.8 litres, the pressure must be A) 2 atm B) 4 atm C) 3 atm D) 1 atm PV = nRT → P = nRT/V 72 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 72) Gas equation PV = nRT is obeyed by A) Only isothermal process B) None of these C) Both a) and b) D) Only adiabatic process PV = nRT is obeyed by isothermal process and adiabatic process. 73 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 73) 40.0 dm³ of an ideal gas at 25°C and 750 mm Hg is expanded to 50.0 dm³. The pressure of the gas changed to 765 mm Hg. What is the temperature of the gas? ETEA 2013 A) ((298)(750)(40))/((50)(765)) B) (750)(40)/(298)(765)(50) C) ((2912)(750)(50))/((40)(765)) D) ((2912)(765)(50))/((750)(40)) (P1 V1)/T1 =(P2 V2)/T2 → T2 = (P1 V1 T1)/(T1 V1 )=((765)(50)(298))/((750)(40)) 74 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Liquefaction of Gases 74) However great the pressure, a gas cannot be liquefied above its A) Boyle temperature B) Critical temperature C) Inversion temperature D) Room temperature However great the pressure, a gas cannot be liquefied above its Critical temperature 75 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> REAL GASES AND VAN DER WAALS EQUATION 75) Gases deviate from ideal gas behaviour because their molecules: A) Possess negligible volume B) Have forces of attraction between them C) Are not attracted to one another D) Are polyatomic Because molecules of real gases have intermolecular forces of attraction so the effective impact on the wall of container is diminished. Pressure of real gas is reduced by a/v2 factor hence behaviour of real gas deviate from ideal behaviour. 76 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> Graham’s law of diffusion 76) If a single balloon is filled with equal volumes of hydrogen, helium, nitrogen, and neon, which gas will be depleted first? (ETEA 2007) A) Neon B) Nitrogen C) Hydrogen D) Helium Lighter gases effuse faster (Graham’s Law). Since H₂ is the lightest (2 g/mol), it will escape first. 77 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 77) Which of the following gas is more ideal at STP? NUMS 2015 A) SO₂ B) H₂ C) NH₃ D) H₂S Hydrogen is a small, non-polar molecule with weak intermolecular forces, making it behave closest to an ideal gas. 78 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 78) S.I. unit of gas constant R is A) 8.31 joule K⁻¹ mole⁻¹ B) 0.0821 litre atm K⁻¹ mole⁻¹ C) None D) 2 calories K⁻¹ mole⁻¹ S.I. unit of gas constant R is 8.31 joule K-1mole-1 79 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> IDEAL GAS EQUATION , DEVIATION FROM IDEAL GAS/ VANDER WAALS EQUATION 79) A certain mass of gas occupies a volume of 300 c.c. at 27°C and 620 mm pressure. The volume of this gas at 47°C and 640 mm pressure will be A) 510 c.c. B) 400 c.c. C) 310 c.c. D) 350 c.c. 80 / 80 Category: BOMVirtual.com >> Chemistry >> 04 Gases >> KINETIC MOLECULAR THEORY OF GASES AND MOLECULAR COLLISIONS 80) In deriving the kinetic gas equation, use is made of the root mean square velocity of the molecules because it is: A) The average velocity of the molecules B) The most probable velocity of the molecules C) The square root of the average square velocity of the molecules D) The most accurate form in which velocity can be used in these calculations In deriving the kinetic gas equation, use is made of the root mean square velocity of the molecules because it is The most accurate form in which velocity can be used in these calculations Your score is 0% Restart quiz
