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AFMC AFMC Solved Paper-2010

  • question_answer
    Which of the following compounds, on reaction with NaOH and \[N{{a}_{2}}{{O}_{2}},\]gives yellow colour?

    A)  \[Zn{{(OH)}_{2}}\]         

    B)  \[Al{{(OH)}_{3}}\]

    C)  \[Cr{{(OH)}_{3}}\]     

    D)  \[CaC{{O}_{3}}\]

    Correct Answer: C

    Solution :

                     Chromium hydroxide, \[Cr{{(OH)}_{3}},\]when reacts with \[\text{NaOH}\] and \[N{{a}_{2}}{{O}_{2}},\]gives sodium chromate, which is yellow in colour. \[3N{{a}_{2}}{{O}_{2}}+2Cr{{(OH)}_{3}}\xrightarrow[{}]{{}}\underset{yellow}{\mathop{2N{{a}_{2}}Cr{{O}_{4}}}}\,\] \[2{{H}_{2}}O+2NaOH\]


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