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Banking Chemistry General Concepts of Chemistry Question Bank General Concepts of Chemistry

  • question_answer
    When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is formed. This is an example of

    A)  combination reaction

    B)  displacement reaction

    C)  decomposition reaction

    D)  double decomposition reaction  

    Correct Answer: D

    Solution :

     \[CuS{{O}_{4}}+{{H}_{2}}S\to CuS\downarrow +{{H}_{2}}S{{O}_{4}}\]             (Blue)           (Black)


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