Question

why a brown fume is emitted during a decomposition reaction. explanation with reaction

Answer 1

The reaction is this

Answer 2

The brown fumes liberated when lead nitrate is heated are of Nitrogen dioxide. This is the thermal decomposition reaction. The balanced chemical equation for this reaction is the following:

${2Pb({NO}_{3} ) }_{2} →2PbO + {4NO}_{2} + {O}_{2}$

Thus this will be the reaction when lead nitrate is heated and will release Nitrogen dioxide.

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