Question

A metal nitrate "A"on heating gives yellowish brown colour.. write about this , observation , conclusion and reaction

Answer 1

heya!
here's your answer!
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➡ the metal nitrate is a salt which gives yellowish brown colour on heating 

➡ a crackling sound is heard and the salt decripitates

➡it is necessary to know that lead oxide (PbO) has a yellowish brown colour on heating the nitrate

➡ brown fumes may also come out from the test tube 

➡since the salt is a nitrate - the name of the salt is lead nitrate 
i.e. Pb(NO3)2

and the above reaction is:-

2Pb(NO3)2 -------> 2 PbO + 4NO2 + O2 ⬆

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Hope this helps you:)

Answer 2

Hi friend,

Your answer:

The metal nitrate "A" is Pb(NO3)2, lead nitrate.

On strong heating, the metal nitrate decripitates and reddish brown colour fumes are observed around the test tube.

2 Pb(NO3)2 (s) → 2 PbO (s) + 4 NO2(g) + O2 (g)

Hope it helps!