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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Mock Test - Principles Related to Practical Chemistry

  • question_answer
    A red solid is insoluble in water. However, it becomes soluble if some KI is added to water, heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is

    A) \[HgO\] 

    B) \[P{{b}_{3}}{{O}_{4}}\]

    C) \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\]           

    D) \[Hg{{I}_{2}}\]

    Correct Answer: D

    Solution :

    [d] \[Hg{{I}_{2}}\] on heating liberates \[{{I}_{2}}\]with \[Hg\]deposition. Also, it is soluble in excess of KI giving\[{{K}_{2}}Hg{{I}_{4}}\]. \[Hg{{I}_{2}}\xrightarrow{\Delta }Hg+{{I}_{2}}\] \[Hg{{I}_{2}}+2KI\xrightarrow{{}}{{K}_{2}}Hg{{I}_{4}}\]


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