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

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

A

Magnesium nitrate

B

Calcium nitrate

C

Barium nitrate

D

Stronitium nitrate.

Answer

Calcium nitrate

Explanation

Solution

: Calcium imparts brick red colour to the flame and calcium nitrate evolves O2O_{2} nad a brown gas, NO2NO_{2} upon heating.

2Ca(NO3)2→Δ2CaO+O2+4NO2↑(Browngas)2Ca(NO_{3})_{2}\overset{\quad\Delta\quad}{\rightarrow}2CaO + O_{2} + \underset{(Browngas)}{4NO_{2} \uparrow}