ELECTROCHEMISTRY MCQ

The standard reduction potential of metals A,B,C and D are -0.40v, +0.34v,+0.8v and -1.67v. The metal that can displace all others is

• D

• B

• A

• C

When tin is over iron, it acts as an oxidizing agent and protects iron.

• TRUE

• FALSE

The equilibrium constants of two redox reactions X and Y are 1.5 x10¹⁵ and 5.5 x 10¹⁶ . Reaction X is more spontaneous than Y.

• FALSE

• TRUE

Cu∣Cu2+∥Fe2+,Fe3+∣Pt In this cell

• Copper ion is the oxidizing agent

• Copper is the oxidizing agent

• Fe3+ is the oxidizing agent

• Fe2+ is the oxidizing agent

When KMnO4 acts as an oxidizing agent and ultimately forms MnO42–, MnO2, Mn2O3 and Mn2+, then the number of electrons transferred in each case is

• 3,4,1,5

• 1,3,4,5

• 5,4,3,1

• 4,5,31

Given: (i) Cu2+ + 2e- → Cu, Eo = 0.337 V

(ii) Cu2+ + e- → Cu+, Eo = 0.153 V

Electrode potential E° for the reaction Cu+ + e– → Cu will be

• 0.284v

• 0.530v

• 0.184v

• 0.380v

The standard reduction potential value of the three metallic cations X, Y and Z are 0.52, -3.03 and -1.18 V respectively. the order of reducing power of the corresponding metals is

• Y>X>Z

• X>Y>Z

• X>Z>Y

• Y>Z>X

Chlorine can not displace

• F from NaF

• I from NaI

• Br from NaBr

• F and I from salt solution

Which of the following will form the cathode with respect to iron anode in an electrolyte cell - ( Eo = - 0.40 v)

• Mg ( - 2.37v)

• Cd (- 0.44v)

• Ni (- 0.22v)

• Al (-1.67v)

Electrolytic conduction differs from metallic conduction in the fact in the case of electrolytic conduction

• Resistance decreases with increase in temperature

• It does not heat up the wire

• Resistance increases with increase in temperature

• Resistance is independent of temperature