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Question

A white salt on heating decomposes to give brown fumes and yellow is left behind name the salt and write the reaction involved

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Solution

A white substance heated is lead nitrate (Pb(NO3))2.
Brown fumes that is given out is of nitrogen dioxide (NO2)
Yellow residue that is left behind is of lead oxide ( PbO).
The reaction is:

2Pb(NO3)2 → 2PbO + O2+ 4NOā€‹2

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