MCQ Questions for Class 12 Chemistry Chapter 3 Electrochemistry with Answers

Electrochemistry Class 12 Chemistry MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 3 Electrochemistry with Answers Pdf free download. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. We have Provided Electrochemistry Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well.

Class 12 Chemistry Chapter 3 Quiz

Class 12 Chemistry Chapter 3 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Chemistry Chapter 3 Electrochemistry to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Electrochemistry Class 12 Chemistry MCQ online test

Q1.	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

Ans: 31.76 gm of Cu

Q2.	Fused NaCl on electrolysis gives ………….. on cathode.
	A.Chlroine
	B.Sodium
	C.Sodium amalgam
	D.Hydrogen

Ans: Sodium

Q3.	The standard electrode potentials for the half cell reactions are: Zn → Zn^2-– 2e^– E° = 0.76 V Fe → Fe^2- + 2^– E° = -0.41 V The emf of the cell reaction Fe^2- + Zn → Zn^2- + Fe is
	A.-0.35 V
	B.+0.35 V
	C.-1.17 V
	D.+1.17 V

Ans: +0.35 V

Q4.	Which of the following is a secondary cell?
	A.Leclanche cell
	B.Lead storage battery
	C.Concentration cell
	D.All of these

Ans: Lead storage battery

Q5.	For a certain redox reaction, E° is positive. This means that
	A.ΔG° is positive, K is greater than 1
	B.ΔG° is positive, K is less than 1
	C.ΔG° is negative, K is greater than 1
	D.ΔG° is negative, K is less than 1

Ans: ΔG° is negative, K is greater than 1

Q6.	Cell reaction is spontaneous, when
	A.E\(_{red}^{0}\) is negative
	B.ΔG° is negative
	C.E\(_{oxid}^{0}\) is Positive
	D.ΔG° is positive

Ans: ΔG° is negative

Q7.	Equilibrium constant K is related to E\(_{cell}^{0}\) and not E\(_{cell}\) because
	A.E\(_{cell}^{0}\) is easier to measure than E\(_{cell}\)
	B.E\(_{cell}\) becomes zero at equilibrium point but E\(_{cell}^{0}\) remains constant under all conditions
	C.at a given temperature, E\(_{cell}\) changes hence value of K can’t be measured
	D.any of the terms E\(_{cell}\) or E\(_{cell}^{0}\) can be used

Ans: E\(_{cell}\) becomes zero at equilibrium point but E\(_{cell}^{0}\) remains constant under all conditions

Q8.	Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity of 0.0152 S cm^-1 w ill be
	A.124 Ω^-1 cm² mol^-1
	B.204 Ω^-1 cm² mol^-1
	C.101 Ω^-1 cm² mol^-1
	D.300 Ω^-1 cm² mol^-1

Ans: 101 Ω^-1 cm² mol^-1

Q9.	Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on
	A.the nature and structure of the metal
	B.the number of valence electrons per atom
	C.change in temperature
	D.all of these

Ans: all of these

Q10.	The specific conductivity of N/10 KCl solution at 20°C is 0.0212 ohm^-1 cm^-1 and the resistance of the cell containing this solution at 20°C is 55 ohm. The cell constant is
	A.3.324 cm^-1
	B.1.166 cm^-1
	C.2.372 cm^-1
	D.3.682 cm^-1

Ans: 1.166 cm^-1

Q11.	Faraday’s law of electrolysis is related to
	A.Atomic number of cation
	B.Speed of cation
	C.Speed of anion
	D.Equivalent weight of electrolyte

Ans: Equivalent weight of electrolyte

Q12.	The molar conductivity is maximum for the solution of concentration
	A.0.004 M
	B.0.002 M
	C.0.005 M
	D.0.001 M

Ans: 0.001 M

Q13.	Units of the properties measured are given below. Which of the properties has been not matched correctly?
	A.Molar conductance = Sm² mol^-1
	B.Cell constant = m^-1
	C.Specific conductance of = S m²
	D.Equivalence conductance = S m² (g eq)^-1

Ans: Specific conductance of = S m²

Q14.	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

Ans: 1.42 h

Q15.	The charge required for reducing 1 mole of MnO\(_{4}^{-}\) to Mn^2- is
	A.1.93 × 10⁵ C
	B.2.895 × 10⁵ C
	C.4.28 × 10⁵ C
	D.4.825 × 10⁵ C

Ans: 4.825 × 10⁵ C

Q16.	How much electricity in in terms of Faraday is required to produce 100 g of Ca from molten CaCl₂?
	A.1F
	B.2F
	C.3F
	D.5F

Ans: 5F

Q17.	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.2.25 × 10²² electrons
	B.1.13 × 10²³ electrons
	C.1.01 × 10²³ electrons
	D.4.5 × 10²³ electrons

Ans: 1.01 × 10²³ electrons

Q18.	How many coulombs of electricity is required to reduce 1 mole of Cr₂O\(_{7}^{2-}\) in acidic medium?
	A.4 × 96500 C
	B.6 × 96500 C
	C.2 × 96500 C
	D.1 × 96500 C

Ans: 6 × 96500 C

Q19.	A current of 1.40 ampere is passed through 500 mL of 0.180 M solution of zinc sulphate for 200 seconds. What will be the molarity of Zn²⁺ions after deposition of zinc?
	A.0.154 M
	B.0.177 M
	C.2 M
	D.0.180 M

Ans: 0.177 M

Q20.	How much time is required to deposit 1 × 10^-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