JEE Main & Advanced Sample Paper JEE Main Sample Paper-19

  • question_answer A metal which is not affected by cone. \[{{H}_{2}}S{{O}_{4}},HN{{O}_{3}}\] or alkalis forms a compound X. This compound X can be used to give a complex which finds its application for toning in photography? The metal is

    A)  \[Au\]                          

    B)  \[Ag\]

    C)  \[Hg\]                          

    D)  \[Cu\]

    Correct Answer: A

    Solution :

     \[Au,\] the gold is not attacked by acids and alkalis. It forms \[AuC{{l}_{3}}\].\[AuC{{l}_{3}}\] farther reacts with \[HCl\] to form \[H[Au{{(Cl)}_{4}}]\] which is used in photography. \[AuC{{l}_{3}}+HCl\xrightarrow[{}]{}\underset{Complex}{\mathop{H[Au{{(Cl)}_{4}}]}}\,\]


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