MCQ
Which of the following is correct ?
- AMercurous, Mercuric ion both are diamagnetic
- B$SnCl_2 > SnCl_4$ (Melting point)
- CBoth $(A)$ and $(B)$ are correct
- ✓In $H_3O^+$ , only covalent bond are present
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Reason : Transparent bead $(NaBO_2 + B_2O_3)$ forms coloured bead with coloured cation.

$A$. Compound ' $B$ ' is aromatic
$B$. The completion of above reaction is very slow
$C$. '$A$' shows tautomerism
$D$. The bond lengths $C - C$ in compound $B$ are found to be same
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