MCQ
On heating $KMnO_4$, one among the following isnot formed
- A$K_2MnO_4$
- B$O_2$
- C$MnO_2$
- ✓$MnO$
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$(A)$ $Rb$ and $Cs$
$(B)$ $Na$ and $K$
$(C)$ $Ar$ and $Kr$
$(D)$ $I$ and $At$
Choose the correct answer from the options given below.

Assume $100 \%$ ionization for both $NaCl$ and $MgCl _2$
Given : $K _{ b }\left( H _2 O \right)=0.52\,K\,kg\,mol ^{-1}$
Molar mass of $NaCl$ and $MgCl _2$ is 58.5 and $95\,g$ $mol ^{-1}$ respectively.
Compound $(A)$ exist in geometrical isomers and $(B)$ gives Cannizaro reaction. $(A)$ will be