How many of the following nitrates of metal $M$ decompose on heating similar to as given below in the scheme?
where $M : L i, B e, M g, K, C a, S r, N a, R b, B a$
$Metal nitrate heat - - \to Metal oxide + Nitrogen dioxide + oxygen gas$

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Solution

Lithium nitrate decomposes as:
$2 L i N O_{3} heat - - \to 2 L i_{2} O + 4 N O_{2} + O_{2}$

$N a, K, R b$ decomposes as follows:
$2 N a N O_{3} heat - - \to 2 N a N O_{2} + O_{2}$

$B e, M g, C a, S r, B a$ decomposes as:
$2 M g (N O_{3})_{2} heat - - \to 2 M g O + 4 N O_{2} + O_{2}$

Hence, out of the given metals, nitrates of $6$ metals $(L i, B e, M g, C a, S r, B a)$ will decompose according to the given scheme.

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