When a student heated a colourless solid compound, then brown fumes of a gas are evolved. The colourless solid is most likely to be :(1) ferrous sulphate (2) lead carbonate(3) lead nitrate (4) lead sulphate

Correct Answer:  (3) lead nitrate 

Explanation: On heating lead nitrate, it decomposes into simpler substances, they impart different colour to the solution.

$2Pb(NO_3)_2 → 2PbO + 4NO_2 + O_2$

colourless     yellow ppt    brown fumes

NO₂ gas imparts brown fumes to the solution.

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Updated on: 10-Oct-2022

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