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Question

Chemistry Question on d -and f -Block Elements

When MnO2MnO_2 is fused with KOHKOH and O2O_2, what is the product formed and its colour? MnO2+KOH+O2?+H2OMnO_2 + KOH + O_2 \to ? + H_2O

A

MnOMnO - colourless

B

KMnO4KMnO_4 - purple

C

K2MnO4K_2MnO_4 - dark green

D

MnO3MnO_3 - black

Answer

K2MnO4K_2MnO_4 - dark green

Explanation

Solution

2MnO2+4KOH+O2> {2MnO2 + 4KOH + O2 ->} \cf2K2MnO4dark green\underset{\text{dark green}}{\cf{2K2MnO4}} +2H2O {+ 2H2O}