05 liquids Premium VersionBy Bomvirtual.com / June 8, 2025 0% 0 votes, 0 avg 45 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980 Created by Bomvirtual.com 05 liquids Premium Version 1 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> coordinate covalent bond 1) A coordinate bond is formed when an atom in a molecule has A) A single unshared electron B) One or more unshared electron pair C) All its valency electrons shared D) Electric charge on it Atoms with lone pairs (like N, O) can donate them to form coordinate bonds (e.g., NH₄⁺, H₃O⁺). 2 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 2) When two ice cubes are pressed over each other, they unite to form one cube. Which of the following force is responsible for holding them together A) Covalent attraction B) Vander Waal’s forces C) Dipole-dipole attraction D) Hydrogen bond formation In ice cube all molecules are held by inter molecular hydrogen bond. 3 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> coordinate covalent bond 3) Coordinate covalent compounds are formed by A) Donation of electrons B) None of these process C) Sharing of electrons D) Transfer of electrons In coordinate covalent bonding, one atom donates both electrons to form a shared bond (e.g., NH₄⁺, H₃O⁺). 4 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 4) Ionic compound’s A) Insoluble in polar solvent B) Boiling points are low C) Melting points are low D) Conduct current in fused state Electrovalent compounds are good conductor of heat and electricity in molten state or in aqueous solution. 5 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 5) Which is the weakest among the following types of bond A) Covalent bond B) Ionic bond C) Metallic bond D) Hydrogen bond Hydrogen bonding is developed due to inter atomic attraction so it is the weakest. 6 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 6) Steam causes severe burns than boiling water. It is due to (ETEA 2019) A) High latent heat of vaporization B) Statement is incorrect C) Freely moving molecules D) Absence of hydrogen bonding Steam releases a significant amount of latent heat when it condenses on the skin, more so than boiling water at the same temperature, leading to more severe burns. 7 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> INTRAMOLECULAR FORCES 7) Hydrogen bonding do not exist in the molecule of: (ETEA 2014) A) Carbohydrates B) Proteins C) Hydrogen D) Ammonia Hydrogen (H₂) is a non-polar molecule with no N-H, O-H, or F-H bonds, so it cannot form hydrogen bonds. 8 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 8) Which one is not related with evaporation? (NUMS 2015) A) Endothermic B) Exothermic C) Spontaneous D) Continuous Evaporation is an endothermic process because it absorbs heat from the surroundings to convert liquid into vapor. 9 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 9) When sodium and chlorine reacts then A) Energy is released and ionic bond is formed B) Energy is released and a covalent bond is formed C) Energy is absorbed and ionic bond is formed D) Energy is absorbed and covalent bond is formed Bond formation is always exothermic. Compounds of sodium are ionic. 10 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 10) The electronic configuration of a metal M is 1s², 2s², 2p⁶, 3s¹, The formula of its oxides will be A) M₂O₃ B) MO C) MO₂ D) M₂O The electronic configuration of Na(Z = 11) is 1s2 , 2s2 , 2p2 , 3s1 . The oxide of Na is Na2 O 11 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 11) Among the following which property is commonly exhibited by a covalent compound A) Low boiling point B) High electrical conductance C) High melting point D) High solubility in water Covalent compounds generally have low boiling and melting points due to weak intermolecular forces (e.g., Van der Waals forces, dipole-dipole interactions). They are also usually poor conductors of electricity and less soluble in water. 12 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 12) From the following which group of elements easily forms cation A) F, Cl, Br B) O, S, Se C) Li, Na, K D) N, P, As Li, Na and K are alkali metals with low ionization energy and one electron in their outermost shell so they will form cation easily. 13 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 13) Select the compound from the following which dissolves in water A) CS₂ B) C₂H₅OH C) CHCl₃ D) CCl₄ Ethanol will dissolve in water because it forms hydrogen bond with water molecule. 14 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 14) Which of the following compounds are covalent A) Na₂S B) CaO C) KCl D) H₂ Two identical atoms are joined with covalent bond so H2 will be covalent. 15 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 15) Solid NaCl is a bad conductor of electricity since A) In solid NaCl there are no electrons B) In solid NaCl there is no motion of ions C) In solid NaCl there are no ions D) Solid NaCl is covalent Solid NaCl is a bad conductor of electricity since `In solid NaCl there is no motion of ions 16 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 16) Which of the following halides has maximum melting point A) NaBr B) NaF C) NaCl D) NaI NaF has maximum melting point, melting point decreases of sodium halide with increase in size of halide their bond energy get lower. 17 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 17) Which of the following has the lowest vapour pressure at 20°C? (MDCAT 2020) A) Chloroform B) Water C) Carbon tetrachloride D) Diethyl ether Water has strong hydrogen bonding, leading to the lowest vapor pressure compared to diethyl ether, chloroform, and carbon tetrachloride. 18 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> INTRAMOLECULAR FORCES 18) Choose the compound in which hydrogen bonding is not possible: (ETEA 2014) A) HCl B) CH₃COOH C) H₂O D) CH₃OCH₃ Compounds having F,O & N atoms can form hydrogen bonding. 19 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> INTRAMOLECULAR FORCES 19) Boiling point of ammonia (NH₃) is greater than that of PH₃ due to (KMU-CAT 2023) A) Hydrogen bonding B) Dispersion forces C) Greater molar mass D) Dipole-dipole force NH₃ forms hydrogen bonds (N-H···N), requiring more energy to boil., PH₃ has weaker dipole-dipole forces (b) and no H-bonding. 20 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 20) What metals combine with non-metals, the metal atom tends to A) None of these B) Lose electrons C) Remain electrically neutral D) Gain electrons Metal tends to lose electrons due to low ionization energy. 21 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 21) Two element have electronegativity of 1.2 and 3.0. Bond formed between them would be A) Polar covalent B) Metallic C) Ionic D) Co-ordinate When electronegativity difference is from 1.7 to 3.0. This bond is called as ionic bond. 22 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 22) Methanol and ethanol are miscible in water due to A) Oxygen bonding character B) Covalent character C) None of these D) Hydrogen bonding character Both methanol and ethanol can form hydrogen bonds with water, making them highly miscible. 23 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 23) The distillation carried out under reduced pressure is called ______ (ETEA 2022) A) Vacuum distillation B) Simple distillation C) Steam distillation D) Fractional distillation Distillation carried out under reduced pressure (lower than atmospheric pressure) is known as Vacuum distillation. This technique is used to distill substances at a temperature lower than their normal boiling point by reducing the pressure above the liquid. 24 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 24) In the following which substance will have highest boiling point A) CsF B) NH₃ C) CHCl₃ D) He Because CsF is electrovalent compound. 25 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 25) An element X with the electronic configuration 1s², 2s² 2p⁶, 3s² would be expected to form the chloride with the formula A) XCl B) XCl₂ C) XCl₃ D) X₂Cl This X element is a second group element so its chloride will be XCl2 26 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> INTRAMOLECULAR FORCES 26) London dispersion forces (forces between the particles) are present in: (ETEA 2008) A) Solids only B) All of the above C) Gases only D) Liquids only London forces exist in all states of matter, though they are more prominent in gases and non-polar substances. 27 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 27) What is the effect of more electronegative atom on the strength of ionic bond A) Decreases B) Decreases slowly C) Increases D) Remains the same As soon as the electronegativity increases, ionic bond strength increases. 28 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 28) The nature of bonding in graphite is A) Coordinate B) Covalent C) Ionic D) Metallic In graphite all carbon atoms are sp2 -hybridised and have covalent bond. 29 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 29) Compound having lowest boiling point is (ETEA 2023) A) Benzene B) Acetic acid C) Carbon tetrachloride D) Ethyl alcohol Acid > phenol > water > alcohol > CS2 > CCl4 30 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 30) Which of the following statements regarding covalent bond is not true A) The bond formed may or may not be polar B) The bond is non-directional C) The strength of the bond depends upon the extent of overlapping D) The electrons are shared between atoms Covalent bond is directional. 31 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 31) Indicate the nature of bonding in CCl₄ and CaH₂ A) Ionic in CCl₄ and covalent in CaH₂ B) Covalent in both CCl₄ and CaH₂ C) Ionic in both CCl₄ and CaH₂ D) Covalent in CCl₄ and Ionic in CaH₂ CCl₄ (Carbon Tetrachloride) is covalent because carbon shares electrons with chlorine. CaH₂ (Calcium Hydride) is ionic, as Ca²⁺ donates electrons to H⁻. 32 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 32) When NaCl is dissolved in water the sodium ion becomes A) Reduced B) Hydrated C) Hydrolysed D) Oxidized When sodium chloride is dissolved in water, the sodium ion is hydrated. 33 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 33) The interatomic distances in H₂ and Cl₂ molecules are 74 and 198 pm respectively. The bond length of HCl is A) 124 pm B) 136 pm C) 272 pm D) 248 pm H2 = 74, H = 37, Cl2 = 198 . Cl = 99, HCl = 37+99 = 136 pm 34 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 34) Which of the following compounds has lowest boiling point? (ETEA 2022) A) Ethanol B) Water C) Hydrogen sulphide D) Acetic acid Acid > phenol > water > alcohol > CS2 > CCl4 35 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 35) The main reaction during Ionic bond formation is A) Elimination reaction B) Substitution reaction C) Addition reaction D) Redox reaction Electrovalent bond is formed by losing electrons from one atom and gaining electron by other atom i.e. redox reaction. 36 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 36) Vapor pressure of a liquid does not depend on (ETEA 2019) A) Temperature B) Amount of liquid C) Intermolecular forces D) Amount of solid dissolved in liquid Vapor pressure of a liquid does not depend on the amount of liquid. 37 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 37) H-bond is not present in A) Hydrogen Sulphide B) Water C) Glycerol D) Hydrogen fluoride H₂S does not form significant hydrogen bonds because sulfur is less electronegative than oxygen, nitrogen, or fluorine. 38 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 38) Element x is strongly electropositive and y is strongly electronegative. Both element are univalent, the compounds formed from their combination will be A) x → y B) x⁺ y⁻ C) x – y D) x⁻ y⁺ X loses electron, Y gains it. 39 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 39) Covalent compounds are generally …… in water A) Soluble B) Hydrolysed C) Dissociated D) Insoluble Water is a polar solvent while covalent compounds are nonpolar so they usually insoluble in water. 40 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> INTRAMOLECULAR FORCES 40) Cleaning action of soap is due to: (ETEA 2009) A) Viscosity of water B) High boiling point of water C) Decrease in surface tension of water D) Polarity of water Soap molecules reduce the surface tension of water, allowing it to spread and dissolve grease and dirt more effectively 41 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> INTRAMOLECULAR FORCES 41) Compound with a greater number of hydrogen bonding is: (ETEA 2018) A) H₂SO₄ B) CdS C) CH₃OH D) H₂O Water (H₂O) forms more hydrogen bonds per molecule than methanol (CH₃OH) or sulfuric acid (H₂SO₄), as each molecule can donate and accept two hydrogen bonds. 42 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 42) In which of the following compounds intramolecular hydrogen bond is present A) Salicylaldehyde B) Ethyl alcohol C) Hydrogen sulphide D) Water Interamolecular H-bonding. 43 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 43) Hydrogen chloride molecule contains a A) Ionic bond B) Double bond C) Covalent bond D) Coordinate bond HCl molecule has covalent bond. 44 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 44) Which of the following is an Ionic linkage A) CH₄ B) MgCl₂ C) SiCl₄ D) BF₃ MgCl2 has electrovalent linkage because magnesium is electropositive metal while chlorine is electronegative. 45 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> INTRAMOLECULAR FORCES 45) Hydrogen bonding in H-F is stronger than H₂O and NH₃. The highest boiling point among the three; (ETEA 2018) A) H₂O B) NH₃ C) HF D) All have equal boiling points While HF has stronger hydrogen bonds, water forms more hydrogen bonds per molecule, making its boiling point higher than HF and NH₃. 46 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 46) Bond formed in crystal by anion and cation is A) Dipole B) Covalent C) Ionic D) Metallic Crystals formed by the electrostatic attraction between positively charged cations and negatively charged anions are held together by ionic bonds (e.g., NaCl). 47 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> HEAT OF FUSION AND VAPORIZATION 47) The heat of vaporization of the liquid A, B and C are 60, 30 and 40 kcal/mole respectively the order of decreasing inter molecular forces among their molecules is A) B>C>A B) C>B>A C) A>B>C D) A>C>B Higher heat of vaporization indicates stronger intermolecular forces, so A has the strongest forces, followed by C, then B. 48 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 48) The reason for exceptionally high boiling point of water is A) Hydrogen bonding in the molecules of water B) Its high dielectric constant C) Its high specific heat D) Low ionization of water molecules Hydrogen bonding increases the boiling point of compound. 49 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 49) Lattice energy of an ionic compound depends upon A) Charge on the ion only B) Size of the ion only C) Packing of ions only D) Charge on the ion and size of the ion The value of lattice energy depends on the charges present on the two ions and distance between them. It shell be high if charges are high and ionic radii are small. 50 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 50) Which of the following compounds in liquid state does not have hydrogen bonding A) H₂O B) NH₃ C) HF D) C₆H₆ Benzene (C₆H₆) is a nonpolar molecule and does not form hydrogen bonds, unlike H₂O, HF, and NH₃. 51 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 51) The liquid with highest rate of evaporation among the following is: (ETEA 2018) A) N-pentane B) Ethyl alcohol C) Water D) Ammonia N-pentane is a nonpolar hydrocarbon with weak intermolecular forces, leading to faster evaporation compared to water, ethyl alcohol, and ammonia, which have stronger hydrogen bonding. 52 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 52) Ionic compounds do not have A) Soluble in polar solvents B) Hard and brittle nature C) Directional properties D) High melting and boiling point Ionic compounds do not have ☻ Hard and brittle nature ☻High melting and boiling point ☻Soluble in polar solvents 53 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 53) In the following which has highest boiling point A) HF B) HBr C) HI D) HCl H – F has highest boiling point because it has hydrogen bonding. 54 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 54) Ionic and covalent bonds are present in A) NH₄Cl B) CCl₄ C) H₂O D) CaCl₂ NH4 Cl has covalent as well as ionic bond. 55 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> coordinate covalent bond 55) A simple example of a coordinate covalent bond is exhibited by A) NH₃ B) H₂SO₄ C) HCl D) C₂H₂ H2SO4 has co-ordinate covalent bond. 56 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 56) The boiling point of a compound is raised by A) Ionic covalent B) Covalent bonding C) Intramolecular hydrogen bonding D) Intermolecular hydrogen bonding Intermolecular hydrogen bonding compound contain more b.p. compare to intramolecular hydrogen bonding compound. 57 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 57) Which of the following has the lowest vapour pressure at 20°C? (ETEA 2020) A) Water B) Diethyl ether C) Carbon tetrachloride D) Chloroform Water has the lowest vapor pressure at 20°C among the given options due to its strong hydrogen bonding, which makes it less volatile compared to diethyl ether, chloroform, and carbon tetrachloride. 58 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 58) An ionic compound is generally a A) Non-electrolyte B) Good electrolyte C) Neutral D) Weak electrolyte Ionic compounds are good conductors of heat and electricity so they are good electrolyte. 59 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 59) Which forms a crystal of NaCl A) Na and Cl atoms B) None of the above C) NaCl molecules D) Na⁺ and Cl⁻ ions NaCl is ionic crystal so it is formed by Na+ and Cl- ions. 60 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 60) Hydrogen bonding is formed in compounds containing hydrogen and A) Metalloids B) Metal atoms with d-orbitals occupied C) Highly electropositive atoms D) Highly electronegative atoms Hydrogen bond is formed when hydrogen is attached with the atom which is highly electronegative and having small radius. 61 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 61) For the formation of covalent bond, the difference in the value of electronegativities should be A) None of these B) Equal to or less than 1.7 C) 1.7 or more D) More than 1.7 Covalent bond forms when electronegativity difference of two atom is equal to 1.7 or less than 1.7 62 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 62) Which of the following substances when dissolved in water will give a solution that does not conduct electricity A) Urea B) Sodium acetate C) Hydrogen chloride D) Potassium hydroxide Urea solution does not conduct electricity because it is a covalent compound. 63 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> HEAT OF FUSION AND VAPORIZATION 63) Molar heat of vaporization of water is A) 40.7 cal/mol B) 40.7 kcal/mol C) 40.7 J/mol D) 40.7 kJ/mol 40.7 kJ/mol (or 40.7 × 10³ J/mol) is the correct value 64 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 64) Which compound shows the highest boiling point? (ETEA 2019) A) (CH₃CH₂)₃N B) C₂H₅OH C) CH₃COOH D) C₂H₅-O-C₂H₅ Acetic acid has strong hydrogen bonding due to the OH group, giving it a higher boiling point compared to ethanol (C2H5OH), diethyl ether (C2H5-O-C2H5), and triethylamine ((CH3CH2)3N). 65 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 65) The number of electrons involved in the bond formation of N₂ molecule A) 4 B) 2 C) 10 D) 6 In N2 molecule each Nitrogen atom contribute 3e- so total no. of electron’s are 6. 66 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 66) The high boiling point of ethanol compared to dimethyl ether, though both having the same molecular formulae, is due to A) Hydrogen bonding B) Resonance C) Ionic bonding D) Coordinate covalent bonding Ethanol (CH₃CH₂OH) forms strong hydrogen bonds, whereas dimethyl ether (CH₃OCH₃) does not, leading to a higher boiling point for ethanol. 67 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 67) Water is liquid due to A) Covalent bond B) Ionic bond C) Hydrogen bonding D) Vander Waals forces Water molecule has hydrogen bonding so molecules get dissociated so it is liquid. 68 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 68) Compounds showing hydrogen bonding among HF, NH₃, H₂S and PH₃ are A) All the four B) Only HF, NH₃ and PH₃ C) Only NH₃, H₂S and PH₃ D) Only HF and NH₃ HF and NH₃ can form hydrogen bonds due to the high electronegativity of fluorine and nitrogen. H₂S and PH₃ do not form hydrogen bonds significantly because sulfur and phosphorus are less electronegative. 69 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 69) The electron pair which forms a bond between two similar nonmetallic atoms will be A) By complete transfer from one atom to other B) Equally shared in between the two C) In a similar spin condition D) Dissimilar shared between the two Similar atoms form covalent bond. 70 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 70) A pressure cooker reduces cooking time because (ETEA 2022) A) The higher pressure softens food inside B) The boiling point of water rises inside C) Heat is more evenly distributed D) Large heat is used A pressure cooker reduces cooking time because it increases the pressure inside the cooker. According to the basic principles of thermodynamics, an increase in pressure raises the boiling point of water inside the cooker. This allows the water to reach temperatures higher than 100°C (212°F) before boiling, cooking food more quickly. 71 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 71) Contrary to other hydrogen halides, hydrogen fluoride is a liquid because A) HF molecule are hydrogen bonded B) Size of F atom is small C) Fluorine is highly reactive D) HF is a weak acid Hydrogen bonding causes HF to remain in liquid form, unlike other hydrogen halides which are gases. 72 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 72) Evaporation depends upon (ETEA 2018) A) Temperature B) Both a) & b) C) None of the above D) Surface area Evaporation depend upon the nature while rate of evaporation depends upon the temperature and surface area. 73 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 73) NH₃ has a much higher boiling point than PH₃ because A) NH₃ contains ionic bonds whereas PH₃ contains covalent bonds B) NH₃ has a larger molecular weight C) NH₃ forms hydrogen bond D) NH₃ undergoes umbrella inversion It contain intermolecular hydrogen bonding 74 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 74) Ionic bond formation depends on A) Ionization energy B) Electron affinity C) Lattice energy D) All the three above Electrovalent bond formation depends on ionization energy of cation, electron affinity of anion and on lattice energy. 75 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> IONIC BONDING 75) Molten sodium chloride conducts electricity due to the presence of A) Free electrons B) Free molecules C) Free ions D) Atoms of sodium and chlorine Molten sodium chloride conducts electricity due to the presence of free ions. 76 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> HEAT OF FUSION AND VAPORIZATION 76) Molar heat of vaporization is the amount of heat required to convert one mole of A) Liquid into its vapors B) Solids into vapors C) Solid into liquid at its melting point D) A liquid into its vapors at its boiling point The molar heat of vaporization is the energy required to convert one mole of liquid into vapor at its boiling point. 77 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> PROPERTIES OF LIQUIDS 77) CO₂ is a gas at room temperature but SiO₂ is solid. The reason is that (ETEA 2019) A) SiO is ionic B) SiO₂ is polymorphic C) Bonds in SiO₂ are very strong D) Si makes double bonds with O SiO2 is solid at room temperature because the bonds in SiO2 are very strong and form a three-dimensional network that extends throughout the solid. 78 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> COVALENT BONDING 78) Silicon has 4 electrons in the outermost orbit. In forming the bonds A) It loses electrons B) None of these C) It shares electrons D) It gains electrons Silicon has 4 valence electrons, meaning it can neither easily gain nor lose electrons. Instead, it shares electrons to form covalent bonds (e.g., in SiO₂ and SiH₄). 79 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 79) The bond that determines the secondary structure of a protein is A) Coordinate bond B) Covalent bond C) Hydrogen bond D) Ionic bond Hydrogen bonds stabilize alpha-helices and beta-sheets in protein structures. 80 / 80 Category: BOMVirtual.com >> Chemistry >> 05 Liquids >> Hydrogen bonding 80) The boiling point of water is exceptionally high because A) Water molecule is not linear B) There is covalent bond between H and O C) Water molecule is linear D) Water molecules associate due to hydrogen bonding Water molecule contain hydrogen bonding Your score is 0% Restart quiz
