Question

Which metal nitrate gives colourless gas on thermal decomposition
(A) NaNO3 (B) Cu(NO), (C) Ba (NO,), (D) Hg (NO3),
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Answer 1

Answer:

Answer is (A) NaNo3

Explanation:

The nitrates of group I elements, with the exception of lithium nitrate, give off a colourless gas (oxygen) on thermal decomposition.

So, the correct answer can be sodium nitrate, potassium nitrate or caesium nitrate.

Other nitrates given NO2 (brown gas) in addition to oxygen when thermally decomposed. 

Answer 2

The metal nitrate that gives colorless gas on thermal decomposition is NaNO3 which is also known as Sodium Nitrate