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NEET Chemistry Analytical Chemistry Question Bank Self Evaluation Test - Analytical Chemistry

  • 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 :

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


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