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NEET Sample Paper NEET Sample Test Paper-75

  • question_answer
    The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain  Excess \[C{{O}_{2}}\] is bubbled through aqueous solution of B, C is formed which recovered in the solid form. Solid C on gen heating gives back A The compound is

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

    B)  \[CaC{{O}_{3}}\]

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

    D)  \[{{K}_{2}}C{{O}_{3}}\]

    Correct Answer: B

    Solution :

    \[\underset{A}{\mathop{CaC{{O}_{3}}}}\,\,(s)\xrightarrow{\Delta }\,\,CaO\,\,+\,\,C{{O}_{2}}\uparrow \] \[CaO+{{H}_{2}}O \xrightarrow{{}} \underset{B}{\mathop{Ca{{\left( OH \right)}_{2}}}}\, \xrightarrow{2C{{O}_{2}}}\,\,\underset{C}{\mathop{Ca{{\left( HC{{O}_{3}} \right)}_{2}}}}\,\]\[\underset{C}{\mathop{\operatorname{Ca}{{\left( HC{{O}_{3}} \right)}_{2}}}}\,\,\xrightarrow{\Delta }\,\,\underset{A}{\mathop{CaC{{O}_{3}}}}\, + C{{O}_{2}} + {{H}_{2}}O\]


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