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»

Correct answer is (a) Brown fumes of nitrogen dioxide

\(2 pb (NO_3)_2\) \(\overset{\text{heat}}{\longrightarrow}\) \(\underset{\text{Light yellow}}{2pbO↑} + \underset{\text{Reddish-Brown}}{4NO2↑}\) \(+ \underset{\text{colourless}}{O_2\uparrow}\)

Hence, The brown fumes will be nitrogen dioxide.



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