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Q.

Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of

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a

Oxygen

b

Carbon dioxide 

c

Argon

d

Nitrogen

answer is B.

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Detailed Solution

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In the presence of oxygen native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN.

             4Ag + 8NaCN + 2H2O + O2 → 4Na[Ag(CN)2] + 4NaOH

Hence, option (B) is correct.

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