MCQs 1 on "ELECTROCHEMISTRY" Chapter - 3

These are MCQs 1 on "ELECTROCHEMISTRY" 12th Class for practicing of csir net, cbse neet etc.

1. Electrolysis is the process in which a chemical reaction takes place at the expense of

• Chemical energy
• Electrical energy
• Heat energy
• None of these

2. Standard hydrogen electrode has an arbitrarily fixed potential

• 0.00 volt
• 1.00 volt
• 0.10 volt
• None of these

3. The oxidation number of chromium in K₂Cr₂O₇ is

• 14
• 12
• 6
• None of these

4. In the reaction 2 Fe + Cl₂ ==> 2FeCl₃

• Fe is reduced
• Fe is oxidized
• Cl₂ is oxidized
• none of these

5. When fused PbBr₂ is electrolyzed

• Bromine appears at cathode
• Lead is deposited at the cathode
• Lead appears at the anode
• None of these happens

6. When aqueous solution of NaCl is electrolysed

• Cl₂ is evolved at the cathode
• H₂ is evolved at cathode
• Na is deposited at the cathode
• Na appears at the anode

7. During electrolysis of KNO₃, H₂ is evolved at

• Anode
• Cathode
• Both (a) and (b)
• None of these

8. During electrolysis of CuSO4 (aq) using Cu electrodes Cu is deposited at

• Anode
• Cathode
• Both (a) and (b)
• None of these

9. During electrolysis of fused NaCl, which of the following reaction occurs at anode

• Cl^– ions oxidized
• Cl^– ions reduced
• Na⁺ ions oxidized
• Na⁺ ions reduced

10. An electrochemical cell is based upon

• Acid–base reaction
• Redox reaction
• Nuclear reaction
• None of the above