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Chemistry Question on Redox reactions

The reducing agent in the given equations :
4 Ag(s)+8 CN(aq)−+2H2O(aq)+O2(g)→4[Ag(CN)2](aq)−+4 OH(aq)−4\ Ag_{(s)}+8\ CN_{(aq)}^-+2H_2O_{(aq)}+O_{2_{(g)}}\rightarrow4[Ag(CN)_2]_{(aq)}^-+4\ OH_{(aq)}^-
2[Ag(CN)2](aq)−+Zn(s)→[Zn(CN)4](aq)2−+2Ag(s)2[Ag(CN)_2]_{(aq)}^-+Zn_{(s)}\rightarrow[Zn(CN)_4]_{(aq)}^{2-}+2Ag_{(s)}

A

Zn

B

O2

C

H2

D

CN-

Answer

Zn

Explanation

Solution

The correct answer is (A) : Zn.