The S.R.Ps of Cu2+ / Cu, Hg2+ / Hg and Zn2+ / Znare respectively 0.34V, 0.85Vand −0.76V .The wrong statement is

Zn reduces both Cu 2+ and Hg 2+

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The S.R.Ps of Cu²⁺ / Cu, Hg²⁺ / Hg and Zn²⁺ / Znare respectively 0.34V, 0.85Vand −0.76V .The wrong statement is

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Hg reduces Zn²⁺

Cu reduces Hg²⁺

Zn reduces Cu²⁺

Zn reduces both Cu²⁺ and Hg²⁺

answer is C.

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Oxidizing power increases reducing power decreases so mercury reduction potential is more than zinc. So it cannot reduces zinc

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