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KVPY Sample Paper KVPY Stream-SX Model Paper-1

  • question_answer
    \[{{H}_{2}}S\] reacts with lead acetate forming a black compound which reacts with \[{{H}_{2}}{{O}_{2}}\] to form another compound. The colour of the compound is -

    A) Pink                             

    B) black

    C) Yellow              

    D) white

    Correct Answer: D

    Solution :

    [D] \[{{H}_{2}}S+{{(C{{H}_{3}}COO)}_{2}}Pb\]\[\xrightarrow{{}}\underset{black}{\mathop{PbS}}\,+2C{{H}_{3}}COOH\] \[PbS+4{{H}_{4}}{{O}_{2}}\xrightarrow{{}}\underset{White}{\mathop{PbS{{O}_{4}}}}\,+4{{H}_{2}}O\]


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