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Q.

Which of the following gases are brown fumes, when a colourless lead salt is heated and produces a yellow residue and brown fumes?


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a

Nitrogen dioxide gas

b

Oxygen gas

c

Carbon dioxide gas

d

Sulphur dioxide gas 

answer is A.

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Detailed Solution

 Nitrogen dioxide gas are brown fumes that are produced when a colourless lead salt is heated.
Lead nitrate is a colourless salt, when heated, decomposes into three products: lead monoxide, nitrogen dioxide gas, and oxygen. Lead monoxide is a yellow compound, and brown fumes are produced as a result of nitrogen dioxide formation. The reaction involved is:
2Pb(NO3)2(s) + heat → 2PbO(s) + 4NO2(g) + O2(g)
 
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Which of the following gases are brown fumes, when a colourless lead salt is heated and produces a yellow residue and brown fumes?