How many of the following nitrates of me...

How many of the following nitrates of metal 'M' decompose on heating similar to as given below in the scheme? (where `M = Li , Be, Mg, K, Ca, Sr, Na , Rb, Ba)` Metal nitrate `overset("Heat")rarr` metal oxide + nitrogen dioxide + oxygen gas.

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The correct Answer is:

`4LiNO_3 to 2Li_2O + 4NO_2 + O_2`
Other alkali metals decompose as given below,
`2NaNO_3 to 2NaNO_2 +O_2`
All alkaline earth metals decompose in the same way as the `LiNO_3`

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