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  3. Chemistry
  4. A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is:

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Q. A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is:

The s-Block Elements

Solution:

$2 Ca \left( NO _{3}\right)_{2} \stackrel{\Delta}{\longrightarrow } 2 CaO + O _{2}+4 NO _{2}$

Ca gives brick red colour and nitrate gives $O _{2}$ and brown gas of $NO _{2}$