Q.
Out of $Be,$ $Mg,Ca,Sr$ and $Ba$ total number of metal whose nitrates are decomposed according to following reaction:
$2M\left(\left(NO\right)_{3}\right)_{2}\overset{\Delta }{ \rightarrow }$ Residue $+4NO_{2}+O_{2}$
NTA AbhyasNTA Abhyas 2020
Solution: