Chemistry MCQ

Q61. For a spontaneous chemical process, the free energy change is
(a) Positive
(b) Negative
(c) Zero
(d) Depends on whether the reation is exothermic or endothermic

Q62. Colloids can be purified by
(a) Condensation
(b) Condensation
(c) Condensation
(d) Dialysis

Q63. Emulsifier is an agent which
(a) Accelerates the dispersion
(b) Homogenizes the emulsion
(c) Stabilizes an emulsion
(d) Aids the flocculation of emulsion

Q64. Aluminium chloride is
(a) Bronsted Lowry Acid
(b) Arrhenius Acid
(c) Lewis Acid
(d) Lewis Base

Q65. The property of hydrogen which distinguishes it from alkali metals is
(a) Its electropositive character
(b) Its affinity for non-metal
(c) Its reducing character
(d) Its non-metallic character

Q66. The lightest gas which is non-inflammable is
(a) Hydrogen
(b) Helium
(c) Oxygen
(d) Nitrogen

Q67. Sodium is produced by the electrolysis of
(a) Molten sodium carbonate
(b) Molten sodium chloride
(c) Aqueous brine solution
(d) Its cyanide complex

Q68. Neutron was discovered by
(a) J J Thomson
(b) James Chadwick
(c) Rutherford
(d) Priestley

Q69. A subshell with l=2 can take up
(a) 3 electron
(b) 5 electron
(c) 8 electron
(d) 10 electron

Q70. The element with highest ionization potential is
(a) Oxygen
(b) Carbon
(c) Helium
(d) Boron

Q71. Which of the following has no unit
(a) Electronegativity
(b) Electron affinity
(c) Ionization energy
(d) Excitation potential

Q72. Which one of the following is most acidic
(a) Al₂2O₃
(b) Na₂O
(c) MgO
(d) CaO

Q73. Which of the following has the highest lattice energy
(a) KF
(b) CsF
(c) NaF
(d) RbF

Q74. The structure of NaCl crystal is
(a) Body centered cubic
(b) Face centered cubic
(c) Octahedral
(d) Square planar

Q75. The coordination number of body centered atom in cubic structure is
(a) 4
(b) 6
(c) 8
(d) 10

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