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

2 F e S O_{4} (s) Heat - - \to F e_{2} O_{3} (s) + S O_{2} (g) + S O_{3} (g)

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C a C O_{3} (s) Heat - - \to C a O (s) + C O_{2} (g)

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2 A g C l (s) Sunlight - ---- \to 2 A g (s) + C l_{2} (g)

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2 P b (N O_{3})_{2} (s) Heat - - \to 2 P b O (s) + 4 N O_{2} (g) +)_{2} (g)

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Solution

The correct option is D $2 P b (N O_{3})_{2} (s) Heat - - \to 2 P b O (s) + 4 N O_{2} (g) +)_{2} (g)$
Lead nitrate $(2 P b (N O_{3})_{2})$ , on thermal decomposition produces brown fumes. These fumes are of nitrogen dioxide $(N O_{2})$ gas.
$C O_{2}$ and $S O_{2}$ are colourless gas. $S O_{3}$ exists in colourless liquid and gas.

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

The correct option is D 2Pb(NO3)2(s)Heat−−→2PbO(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.