When you take Lead nitrate powder in a boiling tube and heat it, you will observe the emission of brown fumes that are of _____________________.

Question

Accepted Answer

Step 1: Write the thermal decomposition reaction of lead(II) nitrate:

$2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}$.

Step 2: Identify the gaseous products: the equation produces $\mathrm{NO_2}$ (nitrogen dioxide) as a product.

Step 3: Match the gas to its appearance: $\mathrm{NO_2}$ is a brown gas. (Nitric oxide, NO, and nitrous oxide, N$_2$O, are colorless; N$_2$O$_3$ is not the brown gas evolved.)

Therefore the brown fumes are nitrogen dioxide, option (3), which corresponds to choice c.

FINAL_ANSWER: c

Answer

Answer

Answer