JEE Main & Advanced Sample Paper JEE Main Sample Paper-19

  • question_answer An aqueous solution of colourless metal sulphate M gives     a white precipitate with \[N{{H}_{4}}OH\]. This was soluble in excess of \[N{{H}_{4}}OH\]. On passing \[{{H}_{2}}S\] through this solution a white ppt. is formed. The metal M in the salt is         

    A)  \[Ca\]                          

    B)  \[Ba\]

    C)  \[Al\]                           

    D)  \[Zn\]

    Correct Answer: D

    Solution :

     \[Z{{n}^{2+}}+2N{{H}_{4}}OH\xrightarrow{{}}\underset{White\,ppt.}{\mathop{Zn{{(OH)}_{2}}}}\,+2NH_{4}^{+}\] \[Zn{{(OH)}_{2}}+2N{{H}_{4}}OH\xrightarrow{{}}\underset{\text{Soluble}}{\mathop{{{(N{{H}_{4}})}_{2}}Zn{{O}_{2}}}}\,+2{{H}_{2}}O\] \[{{(N{{H}_{4}})}_{2}}Zn{{O}_{2}}+{{H}_{2}}S\xrightarrow{{}}\underset{White\,ppt.}{\mathop{ZnS}}\,+2N{{H}_{4}}OH\]

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