NEET NEET SOLVED PAPER 2019

  • question_answer
    Which of the following reactions are disproportionation reaction? [NEET 5-5-2019]
    (i) \[2C{{u}^{+}}\to C{{u}^{2}}+C{{u}^{0}}\]
    (ii) \[3MnO_{4}^{2+}+4{{H}^{+}}\to 2MnO_{_{4}}^{-}+Mn{{O}_{2}}\]
    \[+2{{H}_{2}}O\]
    (iii) \[2KMn{{O}_{4}}\xrightarrow{\Delta }{{K}_{2}}Mn{{O}_{4}}+Mn{{O}_{2}}\]
    \[+{{O}_{2}}\]
    (iv) \[2MnO_{4}^{-}+3M{{n}^{2+}}+2{{H}_{2}}O\to 5Mn{{O}_{2}}\]
    \[+4{{H}^{\oplus }}\]
    Select the correct option from the following:

    A) (i), (iii) and (iv)

    B) (i) and (iv) only

    C) (i) and (ii) only   

    D) (i), (ii) and (iii)

    Correct Answer: B

    Solution :

    \[{{\overset{+7}{\mathop{KMnO}}\,}_{4}}\to {{K}_{2}}{{\overset{+6}{\mathop{MnO}}\,}_{4}}+{{\overset{+4}{\mathop{MnO}}\,}_{4}}\] \[C{{u}^{+1}}\to C{{u}^{+2}}+C{{u}^{0}}\] Disproportionate \[R{{x}^{n}}\] \[\overset{+6}{\mathop{Mn}}\,O_{4}^{-2}\to \overset{+7}{\mathop{Mn}}\,O_{_{4}}^{-}+4\overset{+4}{\mathop{Mn}}\,{{O}_{2}}\] (i), (ii) only


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