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NEET Sample Paper NEET Sample Test Paper-35

  • question_answer
    Identify the correct order of solubility of \[N{{a}_{2}}S,\]\[CuS\] and \[ZnS\]in aqueous medium

    A)  \[CuS>ZnS>N{{a}_{2}}S\]

    B)  \[ZnS>N{{a}_{2}}S>CuS\]

    C)  \[N{{a}_{2}}S>CuS>ZnS\]

    D)  \[N{{a}_{2}}S>ZnS>CuS\]

    Correct Answer: D

    Solution :

    Alkali metal salts are usually more soluble than the salts of transition metals. Also \[CuS\]is less soluble than \[ZnS\]because of \[3{{d}^{9}}\] configuration of \[C{{u}^{2+}}\]Hence the order of solubility is \[N{{a}_{2}}S>ZnS>CuS\]


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