Question

White crystalline solid when heated changes to yellow compound with a reddish brown gas

Answer 1

HEYA!!!


HERE IS YOUR ANSWER,


⇔ Well the crystalline salt is :

→ Lead Nitrate (PbNO₃)

⇔ The reddish brown gas evolved is :

→ Nitrogen Dioxide (NO₂) 

This gas is evolved when lead nitrate get's oxidized to lead oxide. 


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Answer 2

Answer:

A white coloured crystalline solid when heated, changes to yello compound because it contains nitrate ions . This salt can be any nitrate but if its residue is yellow in colour it proves that it is lead nitrate