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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Wet Test for Acid Radical

  • question_answer
    Gas \[A\] is bubbled through slaked lime when a white precipitate is formed. On prolonged bubbling, the precipitate is dissolved. on heating the resultant solution, the white precipitate reappears with the evolution of gas \[B\]. The gases \[A\] and \[B\] respectively are [DPMT 2004]

    A) \[C{{O}_{2}}\] and \[CO\]

    B) \[CO\] and \[C{{O}_{2}}\]

    C) \[CO\] and \[CO\]

    D) \[C{{O}_{2}}\] and \[C{{O}_{2}}\]

    Correct Answer: D

    Solution :

    According to the equation, \[Ca{{(OH)}_{2}}+C{{O}_{2}}\xrightarrow{\Delta }CaC{{O}_{3}}+{{H}_{2}}O\] \[CaC{{O}_{3}}+{{H}_{2}}O+C{{O}_{2}}\xrightarrow{{}}Ca{{(HC{{O}_{3}})}_{2}}\] \[Ca{{(HC{{O}_{3}})}_{2}}\xrightarrow{\Delta }CaO+{{H}_{2}}O+2C{{O}_{2}}\] Hence, the gas A and B are \[C{{O}_{2}}\]and \[C{{O}_{2}}\] respectively


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