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

  • question_answer
    Mixture is heated with dil. \[{{H}_{2}}S{{O}_{4}}\] and the lead acetate paper turns black by the evolved gases. The mixture contains

    A) Sulphite

    B) Sulphide

    C) Sulphate

    D) Thiosulphate

    Correct Answer: B

    Solution :

    It must be sulphide as \[Pb{{(C{{H}_{3}}COO)}_{2}}\ +\ {{H}_{2}}S\underset{\,\,\,(\text{Black }\,\,\text{ppt}\text{.)}}{\mathop{\to PbS\,\,+}}\,2C{{H}_{3}}COOH\]


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