WBJEE: Important Questions and Preparation Tips – Electrochemistry

In this article, the engineering section of Jagranjosh brings chapter notes of chapter Electrochemistry including important topics like Galvanic Cell, Electrolytic Cell, Faraday's law of Electrolysis, standard state emf of a cell, Nernst equation, molar conductivity etc. About 1-2 questions are always asked from this chapter in the examination.

Some of the important characteristics of these notes are:

1. These notes contain important concepts, formulae and some solved questions.

2. The concept given in these notes is in very concise form.

3. All solutions are explained in a very detailed manner.

4. These notes are based on the latest syllabus of WBJEE examination.

5. These notes are prepared by Subject Experts of Chemistry.

About the exam:

West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

Important Concepts:

WBJEE: Important Questions and Preparation Tips – Solutions

Some solved questions are given below:

Question 1:

At temperature of 298 K the emf of the following electrochemical cell

Ag(s) | Ag⁺ (0.1 M) | |Zn²⁺(0.1M) | Zn(s) will be (given E^o_cell= – 1.562 V)

(a) – 1.532 V

(b) – 1.503 V

(c) 1.532 V

(d) – 3.06 V

Solution 1:

Hence, the correct option is (a).

WBJEE: Important Questions and Preparation Tips – Equilibrium

Question 2:

Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 mA current. The

time required to liberate 0.01 mole of H₂ gas at the cathode is (1 F = 96500 C moP¹)

(a) 9.65 × 10⁴ s

(b) 19.3 × 10⁴ s

(c) 28.95 × 10⁴ s

(d) 38.6 × 10⁴ s

Solution 2:

Hence, the correct option is (b).

WBJEE: Important Questions and Preparation Tips – Basic Concepts of Chemistry

Question 3:

Solution 3:

Hence, the correct option is (d).

WBJEE: Important Questions and Preparation Tips – Atomic Structure

Question 4:

Two Faraday of electricity is passed through a solution of CuSO₄. The mass of copper deposited at the cathode is (at. mass of Cu = 63.5 u)

(a) 0g

(b) 63.5g

(c) 2 g

(d) 127 g

Solution 4:

Hence, the correct option is (b).

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