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Question

Which of the following thermal decomposition reactions occurs with emission of brown fumes?

A
2FeSO4(s)HeatFe2O3(s)+SO2(g)+SO3(g)
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B
CaCO3(s)HeatCaO(s)+CO2(g)
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C
2AgCl(s)Sunlight−−−−2Ag(s)+Cl2(g)
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D
2Pb(NO3)2(s)Heat2PbO(s)+4NO2(g)+)2(g)
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Solution

The correct option is D 2Pb(NO3)2(s)Heat2PbO(s)+4NO2(g)+)2(g)
Lead nitrate (2Pb(NO3)2), on thermal decomposition produces brown fumes. These fumes are of nitrogen dioxide (NO2) gas.
CO2 and SO2 are colourless gas. SO3 exists in colourless liquid and gas.

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