JEE Main Chemistry question

Which has the maximum number of equivalent per mole of the oxidant?

(A)Zn(s)+VO^{2+}(aq)\to Zn^{2+}(aq)+V^{3+}(aq)
(B)Ag(s)+NO_3^-(aq)\to Ag^+(aq)+NO_2(g)
(C)Mg(s)+VO_4^{3-}(aq)\to Mg^{2+}(aq)+V^{2+}(aq)
(D)I^-(aq)+IO_3^-(aq)\to I_3^-(aq)Correct

Answer: (D)

Solution

Equivalents per mole of oxidant equal the change in oxidation number of the oxidised/reduced central atom per formula unit: in (A), V goes from (in ) to , a change of 1; in (B), N goes from to , a change of 1;

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Question ID VK-145324