Bihar Board - Class 12 - Chemistry - Chapter 3: Electrochemistry Multiple Choice Questions ( MCQs)

he multiple choice questions for Chapter 3: Electrochemistry of Class 12 Chemistry are provided here in English. These questions are based on the NCERT curriculum for Class 12. They are designed to help students assess their understanding of the key concepts covered in the chapter. These multiple choice questions will be useful not only for the Class 12 board exams but also for entrance exams like NEET. The questions for Bihar Board Class 12 Chemistry, Chapter 3: Electrochemistry, have been prepared by expert teachers at Vidyakul.

            Multiple Choice Questions 

1.The quantity of charge required to obtain one mole of aluminum from Al2O3 is

(A) 1 F
(B) 6 F
(C) 3 F
(D) 2 F

Answer ⇒ (C) 3 F

2. Use the data given below to find out the strongest reducing agent.

ECr2O72-/Cr3-0 =1.33 V       ECl2/Cl-0=1.36 V

EMnO4-/Mn2+0 =1.51 V       ECr3+/Cr0=-0.74 V

(A) Cl-
(B) Mn2+
(C) MnO4-
(D) Cr3+

Answer ⇒ (D) Cr3+

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3. Units of the properties measured are given below. Which of the properties has not been matched correctly ?

(A) Molar conductance = S m2 mol-1
(B) Cell constant =m-1
(C) Specific conductance of = S m2
(D) Equivalent conductance = S m2  (g eq)-1

Answer ⇒ (C) Specific conductance of = S m2 .

4. How long would it take to deposit 50 g of Al from an electrolytic cell containing Al2O3 using a current of 105 Ampere ?

(A) 1.54 h
(B) 1.42 h
(C) 1.32 h
(D) 2.15 h

Answer ⇒ (B) 1.42 h.

5. The charge required for reducing 1 mole of MnO4- to Mn2+ is

(A) 1.93105 C
(B) 2.895105 C
(C) 4.28105 C
(D) 4.825105 C

Answer ⇒ (D)4.825105 C

6. If a current of 1.5 ampere flows through a metallic wire for 3 hours, then how many electrons would flow through the wire ?

(A) 2.251022 electrons
(B) 1.131023 electrons
(C) 1.011023 electrons
(D) 4.51023 electrons

Answer ⇒ (C)1.011023 electrons

7. How many coulombs of electricity is required to reduce 1 mole of Cr2O72- in an acidic medium ?

(A) 4 96500 C
(B) 6 96500 C
(C) 2 96500 C
(D) 1 96500 C

Answer ⇒ (B) 6 96500 C

8. How much time is required to deposit 110-3 cm thick layer of silver (density of 1.05 g cm-3) on a surface of area 100 cm2 by passing a current of 5 A through AgNO3 solution ?

(A) 125 s
(B) 115 s
(C) 18.7 s
(D) 27.25 s

Answer ⇒ (C) 18.7 s

9. How much metal will be deposited when a current on 12 ampere with 75 % efficiency is passed through the cell for 3 h ? (Given : Z=4 10-4)

(A) 32.4 g
(B) 38.8 g
(C) 36.0 g
(D) 22.4 g

Answer ⇒ (B) 38.8 g

10. An electrochemical cell can behave like an electrolytic cell when

(A) Ecell =0
(B) Ecell  > Eext
(C) Eext >Ecell
(D) Ecell  = Eext

Answer ⇒ (C) Eext >Ecell

12. If 96500 coulomb electricity is passed through CuSO4 solution, it will liberate

(A) 63.5 gm  of Cu
(B) 31.76 gm of Cu
(C) 96500 gm of Cu
(D) 100 gm of Cu