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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2004

  • question_answer
    On heating \[Mn{{(OH)}_{2}}\] with \[Pb{{O}_{2}}\]and cone. \[HN{{O}_{3}}\] pink colour is obtained due to the formation of

    A)  \[KMn{{O}_{4}}\]                           

    B)  \[HMn{{O}_{4}}\]

    C)  \[Pb{{(Mn{{O}_{4}})}_{2}}\]      

    D)  \[PbMn{{O}_{4}}\]

    Correct Answer: B

    Solution :

    On boiling red lead or lead dioxide with conc. \[HN{{O}_{3}},\] they form per manganic acid due to which a deep pink colour is developed.                 \[2M{{n}^{2+}}+5Pb{{O}_{2}}+4{{H}^{+}}\xrightarrow{{}}2MnO_{4}^{-}\]                                                                 \[+5P{{b}^{2+}}+2{{H}_{2}}O\]                 \[2MnC{{l}_{2}}+3{{H}_{2}}O+5O\xrightarrow{{}}2HMn{{O}_{4}}+4HCl\]


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