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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Critical Thinking Analytical

  • question_answer
    A white solid 'A' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid 'A' is   [MP PMT 1999]

    A) Zinc sulphate

    B) Zinc carbonate

    C) Lead sulphate

    D) Lead carbonate

    Correct Answer: B

    Solution :

    \[ZnC{{O}_{3}}\xrightarrow{\Delta }ZnO+\underset{\text{Turns lime water milky}}{\mathop{C{{O}_{2}}}}\,\] \[(\text{Hot})\,\underset{\text{yellow}}{\mathop{ZnO}}\,\underset{\text{White}}{\mathop{ZnO}}\,(\text{Cool})\] 


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