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Question

In the given experiment, on heating lead nitrate powder in a boiling test tube, we observe brown fumes. The emission of brown coloured fumes is due to formation of:


A

Lead Nitrate

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B

Nitrogen Oxide

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C

Nitrogen Dioxide

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D

Lead Oxide

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Solution

The correct option is C

Nitrogen Dioxide


On heating lead nitrate, it undergoes decomposition reaction to form lead oxide, nitrogen dioxide, and oxygen. The reaction is:

2 Pb(NO3)2(s) → 2 PbO(s) + 4 NO2(g) + O2(g)

(Lead nitrate) (Lead oxide) (Nitrogen dioxide) (Oxygen)

The brown coloured fumes are of nitrogen dioxide.


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