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NEET Sample Paper NEET Sample Test Paper-91

  • question_answer
    The compound A on heating gives a colourless gas and a residue which dissolves in water to give B. When excess of \[C{{O}_{2}}\] is passed into B and gently heated, A is formed. The compound A is

    A) \[CaS{{O}_{4}}.2{{H}_{2}}O\]

    B)        \[N{{a}_{2}}C{{O}_{3}}\]

    C) \[CaC{{O}_{3}}\]        

    D)        \[{{K}_{2}}C{{O}_{3}}\]

    Correct Answer: C

    Solution :

    [c] \[CaC{{O}_{3}}\xrightarrow{\Delta }CaO+C{{O}_{2}};\] \[CaO+{{H}_{2}}O\to \underset{(B)}{\mathop{Ca{{(OH)}_{2}}}}\,\] \[Ca{{(OH)}_{2}}+C{{O}_{2}}\to \underset{(A)}{\mathop{CaC{{O}_{3}}+{{H}_{2}}O}}\,\]


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