| Which of the following reactions are disproportionation reaction? [NEET 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 :
| [b]\[{{\overset{+7}{\mathop{KMnO}}\,}_{4}}\to {{K}_{2}}{{\overset{+6}{\mathop{MnO}}\,}_{4}}+{{\overset{+4}{\mathop{MnO}}\,}_{4}}\] |
| \[C{{u}^{+1}}\to C{{u}^{+2}}+C{{u}^{0}}\] |
| 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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