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Q.

Which of the following lead salt is colourless and, on heating, produces a yellow residue and brown fumes?


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a

Lead oxide

b

Lead nitrate

c

Lead sulphate

d

Lead chloride 

answer is B.

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Detailed Solution

Lead nitrate is a colourless lead salt, when heated, produces a yellow residue and brown fumes.
Lead nitrate is a colourless salt which decomposes in the presence of heat to give out three products, lead monoxide, nitrogen dioxide gas, and oxygen. The lead monoxide produced is a yellow-coloured compound, and brown fumes are obtained due to the formation of nitrogen dioxide.
The reaction involved is:
2Pb(NO3)2(s) + heat → 2PbO(s) + 4NO2(g) + O2(g)
 
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