NEET Sample Paper NEET Sample Test Paper-21

  • question_answer
      Which of the following is used in the extraction of silver?

    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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