A nitrate of an alkali metal M on heating gives $O_{2} . {N O}_{2}$ and $M_{2} O$ . The metal M will be:

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Solution

The correct option is D Li
All group $1$ compounds (metal nitrates) decompose to give metal nitrates and
oxygen $\to$
${2 M N O}_{3} \to {2 M N O}_{2} + O_{2}$
Since Lithium shows diagonal relationship with magnesium, it shows different behaviour
${4 L i N O}_{3} \to {2 L i}_{2} O + 4 N O_{2} + O_{2}$
(It's nitrate decomposes like Group $2$ elements)

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