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

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A substance which gives brick red flame and breadks down on heating to give oxygen and a brown gas, is
A. magnesium nitrate
B. calcium nitrate
C. barium nitrate
D. strontium nitrate
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Correct Answer - B
Calcium gives brick red coloured flame. Hence, calcium nitrate on heating decomposes into calcium oxide, with evolution of a mixture of `NO_(2)` and `O_(2)`.
`2Ca(NO_(3))_(2) rarr 2CaO +NO_(2)+O_(2) NO_(2)` is brown coloured gas.
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