CBSE Class 12 Chemistry Electrochemistry Quiz 1

1. If 96500 coulomb electricity is passed through CuSO 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

2. Fused NaCl on electrolysis gives ………….. on cathode.

A Chlroine B Sodium C Sodium amalgam D Hydrogen

3. The standard electrode potentials for the half cell reactions are:

A -0.35 V B +0.35 V C -1.17 V D +1.17 V

4. Which of the following is a secondary cell?

A Leclanche cell B Lead storage battery C Concentration cell D All of these

5. 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

6. 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

7. 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

8. Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity of 0.0152 S cm

A 124 Ω B 204 Ω C 101 Ω D 300 Ω

9. 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

10. The specific conductivity of N/10 KCl solution at 20°C is 0.0212 ohm

A 3.324 cm B 1.166 cm C 2.372 cm D 3.682 cm