Question

10. Which of the following best describes the reaction 2VO3– (aq) + Zn (s) + 8H+ (aq) → 2VO2 (aq) + Zn2+ (aq) + 4H2O (l)? _______
A. It is an ionic bond reaction.
B. It is a covalent bond reaction.
C. It is a redox reaction in which V is oxidized at the cathode, and Zn is reduced at the anode.
D. It is a redox reaction in which O is oxidized at the anode, and Zn is reduced at the cathode.
E. It is a redox reaction in which Zn is oxidized at the anode, and V is reduced at the cathode.

Answer 1

Correct answer is option E. It is a redox reaction in which Zn is oxidized at the anode, and V is reduced at the cathode.

Reason:
In above reaction, the oxidation state of VO3- is +5, while that of VO2 is +4. Thus there is reduction of V from +5 to +4
In case of Zn, oxidation state of Zn is increased from 0 to +2, Thus process is referred as oxidation.