JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Critical Thinking Analytical

  • question_answer
    Three separate samples of a solution of a single salt gave these test results : One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. \[NaCl\] solution and one formed a black precipitate with \[{{H}_{2}}S\]. The salt could be [Pb. PMT 1998]

    A) \[AgN{{O}_{3}}\]

    B) \[Pb{{\left( N{{O}_{3}} \right)}_{2}}\]

    C) \[Hg{{\left( N{{O}_{3}} \right)}_{2}}\]

    D) \[MnS{{O}_{4}}\]

    Correct Answer: A

    Solution :

    \[AgN{{O}_{3}}\] react with all conditions and gives corresponding result. \[AgN{{O}_{3}}+2N{{H}_{3}}\to \underset{\text{White ppt}}{\mathop{[Ag{{(N{{H}_{3}})}_{2}}]N{{O}_{2}}}}\,+{{H}_{2}}O\] \[AgN{{O}_{3}}+NaCl\to \underset{\text{White ppt}}{\mathop{AgCl}}\,+NaN{{O}_{3}}\] \[2AgN{{O}_{3}}+{{H}_{2}}S\to \underset{\text{Black ppt}}{\mathop{A{{g}_{2}}S}}\,+2HN{{O}_{3}}\].


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