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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    The sulphide ion concentration \[[{{S}^{2-}}]\]in saturated \[{{H}_{2}}S\] solution is \[1\times {{10}^{-22}}.\] Which of the following sulphides should be quantitatively precipitated by \[{{H}_{2}}S\] in the presence of dil. \[HCl\] Sulphide               Solubility Product (I)                           \[1.4\times {{10}^{-16}}\] (II)                          \[1.2\times {{10}^{-22}}\] (III)                         \[8.2\times {{10}^{-46}}\] (IV)                        \[5.0\times {{10}^{-34}}\]

    A)                 I, II         

    B)                 III, IV

    C)                 II, III, IV               

    D)                 Only I

    Correct Answer: B

    Solution :

                    Basic radicals of group II & IV are precipitated by \[{{H}_{2}}S\] in the form of their sulphides. IInd group in acidic medium & IV group in alkaline medium. They precipitate when ionic product increases than solubility product.


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