JEE Main & Advanced Sample Paper JEE Main Sample Paper-47

  • question_answer
    A black colored compound [a] in solid state is fused with, \[KOH\]and \[KCl{{O}_{3}}\]and the mixture is extracted with water to obtain a green colour solution [b]. On passing \[C{{O}_{2}}\]through the solution the colour changes to pink with black residue [c]. Which of the following is/are correct?

    A)  The pink colour is decolorized by acidified \[FeS{{O}_{4}}\] solution

    B)  The black residue [c] is same as compound [a]

    C)  When \[{{O}_{3}}\] gas is passed through the green colour solution, it changes to pink

    D)  All of the above

    Correct Answer: D

    Solution :

     \[\underset{\begin{smallmatrix}  Black\,solid \\  A \end{smallmatrix}}{\mathop{3Mn{{O}_{2}}}}\,+6KOH+KCI{{O}_{3}}\xrightarrow[\begin{smallmatrix}  + \\  extraction  \\  with\,\,water \end{smallmatrix}]{Fusion}\] \[\underset{\text{Green}\,\,\text{mass}}{\mathop{3{{K}_{2}}Mn{{O}_{4}}}}\,+KCl+3{{H}_{2}}O\] \[\underset{\text{From}\,\,\text{Green}\,\,\text{solution}}{\mathop{3{{K}_{2}}Mn{{O}_{4}}}}\,+2{{H}_{2}}O+4C{{O}_{2}}\xrightarrow{\,}\] \[2KMn{{O}_{4}}+\underset{(C)}{\mathop{Mn{{O}_{2}}}}\,+4KHC{{O}_{3}}\] \[2{{K}_{2}}Mn{{O}_{4}}+{{O}_{3}}+{{H}_{2}}O\xrightarrow{\,}\,2KMn{{O}_{4}}\] \[+2KOH+{{O}_{2}}\] \[\underset{Pink}{\mathop{2KMn{{O}_{4}}}}\,+B{{H}_{2}}S{{O}_{4}}+10FeS{{O}_{4}}\xrightarrow{\,}\] \[2MnS{{O}_{4}}+{{K}_{2}}S{{O}_{4}}\] \[+5F{{e}_{2}}{{(S{{O}_{4}})}_{3}}+8{{H}_{2}}O\]

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