CBSE Class 12 Electrochemistry Multiple Choice Questions with Answers. MCQ Questions Class 12 Electrochemistry with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Electrochemistry MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Electrochemistry with Answers - Set - 2
Question 1:
If Zn2+/Zn electrode is diluted 100 times, then the change in emf is
(a) increase of 59 mV
(b) decrease of 59 mV
(c) increase of 29.5 mV
(d) decrease of 29.5 mV.
Correct Answer – (B)
Question 2 :
On the basis of information available from the reaction.
4/3 Al + O2 ? 2/3 Al2O3, ?G = – 827 kj mol-1 of O2 the minimum emf required to carry out the electrolysis of Al2O3 is
(a) 2.14 V
(b) 4.28 V
(c) 6.42V
(d) 8.56V
Correct Answer – (A)
Question 3 :
Standard electrode potentials are Fe2+/Fe, E° = – 0.44; Fe3+/Fe2+, E° = 0.77 V. Fe2+, Fe3+ and Fe blocks are kept together then
(a) Fe3+ increases
(b) Fe3+ decreases
(c) Fe2+/Fe3+ remains unchanged
(d) Fe2+ decreases?
Correct Answer – (B)
Question 4 :
The amount of electricity required to deposit 1 mol of aluminium from a solution of AlCl3 will be
(a) 0.33 F
(b) 1 F
(c) 3 F
(d) 1 ampere
Correct Answer – (C)
Question 5 :
4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be:
(a) 44.8 L
(b) 11.2 L
(c) 22.4 L
(d) 5.6 L
Correct Answer – (A)
MCQ Questions Class 12 Electrochemistry with Answers
Question 6:
For a cell reaction involving two electron change the standard emf of the cell is found to be 0.295 V at 25°C. The equilibrium constant for the reaction at 25°C will be:
(a) 2.95 × 10²
(b) 10
(c) 1 × 1010
(d) 1 × 10-10
Correct Answer – (C)
Question 7:
Ionic mobility of Ag+ ions [?Ag+ = 5 × 10-4 ohm-1 cm² eq-1] is
(a) 5.2 × 10-9
(b) 2.4 × 10-9
(c) 1.52 × 10-9
(d) 8.25 × 10-9
Correct Answer – (A)
Question 8:
A current of 2.0 A passed for 5 hours through a molten metal salt deposits 22.2 g of metal (at. wt. = 177). The oxidation state of the metal in the metal salt is
(a) +1
(b) +2
(c) +3
(d) +4
Correct Answer – (C)
Question 9:
For a spontaneous reaction? G, equilibrium constant K and E0cell will be respectively.
(a) – ve > 1, + ve
(b) + ve > 1 – ve
(c) -ve, < 1, -ve
(d) -ve, > 1, -ve
Correct Answer – (A)
Question 10:
The volume of H2 gas at NTP obtained by passing 4 amperes through acidified H+O for 30 minutes is:
(a) 0.0836 L
(b) 0.0432 L
(c) 0.1672 L
(d) 0.836 L
Correct Answer – (A)
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