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NEET Sample Paper NEET Sample Test Paper-17

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

    A) \[Al{{(OH)}_{3}}\]               

    B) \[Zn{{(OH)}_{2}}\]  

    C)      \[CaC{{O}_{3}}\]    

    D)      \[Cr{{(OH)}_{3}}\]

    Correct Answer: D

    Solution :

    Here yellow colour is due to the formation of\[Cr{{O}_{4}}^{2-}\]ion. \[Cr{{(OH)}_{3}}+NaOH+N{{a}_{2}}{{O}_{2}}\to N{{a}_{2}}Cr{{O}_{4}}+2{{H}_{2}}O\] Hence, the correct option is (d).


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