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KVPY Sample Paper KVPY Stream-SX Model Paper-8

  • question_answer
    The electrolytes usually used in the electroplating of gold and silver, respectively, are:

    A) \[{{[Au{{(CN)}_{2}}]}^{-}}\]and \[{{[Ag{{(CN)}_{2}}]}^{-}}\]

    B) \[{{[Au{{(CN)}_{2}}]}^{-}}\]and \[{{[AgC{{l}_{2}}]}^{-}}\]

    C) \[{{[Au{{(OH)}_{4}}]}^{-}}\]and \[{{[Ag{{(OH)}_{2}}]}^{-}}\]

    D)  \[{{[Au{{(N{{H}_{3}})}_{2}}]}^{+}}\]and\[{{[Ag{{(CN)}_{2}}]}^{-}}\]

    Correct Answer: A

    Solution :

    \[{{[Au(C{{N}_{2}})]}^{-}}\]and \[{{[Ag(C{{N}_{2}})]}^{-}}\]both are soluble complexes.


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