Question

The nitrate which does not produce brown gas on heating is
A)KNO3
B)AgNO3
C)Hg(NO3)2
D)Mg(NO3)2

Answer 1

Hii frnd...

I think the answer is (A)KNO3
As,
When we heat KNO3 then it gives KNO2 and O2 gas which is colourless.

Hope it helped u!!!

Answer 2

The nitrate which does not produce brown gas on heating is option A) Potassium Nitrate $\bold{\left(\mathrm{KNO}_{3}\right)}$.

This is because nitrates of monovalent alkali metals on heating give only oxygen gas and forms the respective metal nitrites. Silver Nitrate $\left(\mathrm{AgNO}_{3}\right)$, Mercuric Nitrate $\left\{\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}\right\}$ and Magnesium Nitrate $\left\{\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\right\}$ will produce brown gas on heating as it releases a mixture of reddish brown Nitrogen Dioxide and Oxygen and leave behind the respective metallic oxides.