Question

When lead nitrate powder is heated in a boiling tube, we observe:
(a) Brown fumes of nitrogen dioxide
(b) Brown fumes of lead oxide
(c)Yellow fumes of nitrogen dioxide
(d) Brown fumes of nitric oxide​

Answer 1

When lead nitrate powder is heated in a boiling tube, we observe;

• (a) Brown fumes of nitrogen dioxide
• (b) Brown fumes of lead oxide
• (c) Yellow fumes of nitrogen dioxide
• (d) Brown fumes of nitric oxide.

Answer :  Option (a) Brown fumes of nitrogen dioxide

Explanation : When lead nitrate powder is heated in a boiling tube, It produces reddish Brown fumes of nitrogen dioxide, Light yellow fumes of lead oxide and colourless oxygen gas.

i.e., Pb(NO₃)₂ ⇒ PbO (light yellow) ↑  + NO₂ (brown) ↑ + O₂ (colourless) ↑

Properties of lead nitrate :

• It is an inorganic compound that commonly occurs as a colourless white crystal powder.
• It is used as a heat stabiliser in nylon and polyesters.
• It is used in matches and explosives.
• In the dye, photographic industries and in the process of engraving, we use lead nitrate.

Therefore the correction option is (a) Brown fumes of nitrogen dioxide.

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