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NEET Sample Paper NEET Sample Test Paper-60

  • question_answer
    A sodium salt of unknown anion when treated with \[MgC{{l}_{2}}\] gives white precipitates only-on boiling. The anion is:

    A) \[SO_{4}^{2-}\]                      

    B) \[HCO_{3}^{-}\]   

    C) \[CO_{3}^{2-}\]                      

    D) \[NO_{3}^{-}\]

    Correct Answer: B

    Solution :

    [b] \[HCO_{3}^{-}\] Bicarbonates on heating form insoluble carbonates: \[MgC{{l}_{2}}+2NaHN{{O}_{3}}\to 2NaCl+(Mg{{(HC{{O}_{3}})}_{2}})\] \[Mg{{(HC{{O}_{3}})}_{2}}\xrightarrow{\Delta }MgC{{O}_{3}}\downarrow +\,C{{O}_{2}}+{{H}_{2}}O\]


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