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:

Lead Nitrate

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Nitrogen Oxide

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Nitrogen Dioxide

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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 NO_2(g) + O_2(g)

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

The brown coloured fumes are of nitrogen dioxide.

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