A) cuprous oxide reacts with alkaline \[KMn{{O}_{4}}\]solution.
B) manganese dioxide is fused with \[{{K}_{2}}C{{O}_{3}}\] in presence of \[KN{{O}_{3}}.\]
C) formaldehyde reacts with potassium permanganate in presence of concentrated potassium hydroxide solution.
D) in all of the above
Correct Answer: D
Solution :
| [a] \[KMn{{O}_{4}}+C{{u}_{2}}O+KOH\xrightarrow{{}}2Cu{{(OH)}_{2}}+{{K}_{2}}Mn{{O}_{4}}.\] |
| [b] \[2Mn{{O}_{2}}+2{{K}_{2}}C{{O}_{3}}+{{O}_{2}}(\text{from }KN{{O}_{3}})\xrightarrow{{}}\]\[2{{K}_{2}}Mn{{O}_{4}}+C{{O}_{2}}\] |
| [c] \[HCHO+2KMn{{O}_{4}}+2KOH\xrightarrow[{}]{{}}2{{K}_{2}}Mn{{O}_{4}}\]\[+{{H}_{2}}O+HCOOH\] |
| [d] in all of the above |
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