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Question

The reaction between metallic silver and aqueous NaCN forming a soluble complex occurs in the presence of :


A
Nitrogen
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B
Helium
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C
Argon
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D
Oxygen
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Solution

The correct option is D Oxygen
$$4Ag(s) + 8CN^-(aq)+ 2H_2O(aq) + O_2(g) \rightarrow 4[Ag(CN)_2]^- (aq) + 4OH^-(aq)$$ 

Chemistry

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