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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Chemical stoichiometry

  • question_answer
    The ratio of the molar amounts of \[{{H}_{2}}S\] needed to precipitate the metal ions from \[20mL\] each of \[1M\ Cd{{(N{{O}_{3}})}_{2}}\] and \[0.5M\ CuS{{O}_{4}}\] is          [CPMT 1997]

    A)                 1 : 1

    B)                 2 : 1

    C)                 1 : 2

    D)                 Indefinite

    Correct Answer: B

    Solution :

               \[C{{d}^{+2}}\ \ +\ \ \ \ {{S}^{2-}}\to CdS\]                    20×1= 20                    \[C{{u}^{+2}}+{{S}^{2-}}\to CuS\]                    20×0.5 =10                                                                      Ratio =\[2:1\]


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