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Decomposition Reaction

A white salt ...

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+ 4NO₂

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