NCERT Class 12 Chemistry Multiple Choice Questions(MCQs) & Answers

NCERT Class 12 Chemistry Multiple Choice Questions(MCQs) & Answers NCERT Class 12 Chemistry QUESTIONS

NCERT Class 12 Chemistry Multiple Choice Questions(MCQs) & Answers

21 Trunbull’s blue is
A Ferrous ferricyanide
B Fe3[Fe(CN)6]4
C Ferrous cyanide
D Ferricyanide

Answer: Ferrous ferricyanide
22 Roasted copper pyrites on smelting with sand produces
A FeSiO3 and Cu2S
B Fe3(PO4)2 and Cu2S
C CaSiO2 and Cu2O
D Ca3(PO4)2 and Cu2S

Answer: FeSiO3 and Cu2S
23 Physical adsorption of a gaseous species may change to chemical adsorption with ___________ .
A decrease in temperature
B increase in temperature
C increase in surface area of adsorbent
D decrease in surface area of adsorbent

Answer: increase in temperature
24 When Cl2 reacts with hot and cone. NaOH, the oxidation number of chlorine changes from
A zero to +1 and zero to +5
B 0 to -1 and 0 to +5
C zero to -1 and zero to +3
D 0 to +1 and 0 to -3

Answer: 0 to -1 and 0 to +5
25 The emf of the cell: Ni / Ni2+ (1.0 M) // Au3+ (1.0 M) / Au (E° = -0.25 V for Ni2+/Ni; E° = 1.5 V for Au3+/Au) is
A 1.25 V
B -1.25 V
C 1.75 V
D 2.0 V

Answer: 1.75 V
26 The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is
A 0.5 × 10-3 s-1
B 5.0 × 10-3 s-1
C 0.5 × 10-2 s-1
D 5.0 × 10-2 s-1

Answer: 0.5 × 10-3 s-1
27 The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months?
A 3.60 M
B 0.36 M
C 0.72 M
D None of these

Answer: 0.72 M
28 Fluorine differs from rest of the halogens in some of its properties. This is due to
A its smaller size and high electronegativity.
B lack of d-orbitals.
C low bond dissociation energy.
D All of the these.

Answer: lack of d-orbitals.
29 Which of the following ore is best concentrated by froth floatation process?
A Galena
B Malachite
C Magnetic
D Siderite

Answer: Galena
30 Extraction of gold and silver involves leaching with CN–. Silver is later recovered by
A Displacement by Zn
B Liquation
C Distillation
D Zone refining

Answer: Displacement by Zn

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