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

Correct Answer - B
Calcium imparts brick red colour to the flame and calcium nitrate evolves `O_(2)` and a brown gas, `NO_(2)` upon heating
`2Ca(NO_(3))_(2) overset(Delta)to 2CaO+O_(2)+ underset(("brown gas"))(4NO_(2))uarr`

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

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