A) \[NaCN\]
B) \[N{{a}_{2}}S{{O}_{4}}\]
C) \[N{{a}_{2}}C{{O}_{3}}\]
D) \[NaCl\]
Correct Answer: A
Solution :
\[NaCN\] forms a soluble complex with \[AgCl\] or \[A{{g}_{2}}S.\]Therefore, \[NaCN\] is used. \[4NaCN+A{{g}_{2}}S\to Na[Ag{{(CN)}_{2}}]+N{{a}_{2}}S\] Hence, the correct option is (a).
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