Question

What happens when Lead Nitrate is heated? Why do we observe the emission of brown fumes? Give a balanced chemical equation.

Answer 1

Lead nitrate crystal decompose to
•Lead oxide
•Oxygen
•Nitrogen dioxide( brown in colour)
Residue left is lead monoxide.
It's a decomposition reaction

Answer 2

↑ Here is your answer ↓
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When heat is passed over Lead Nitrate, thermal decomposition takes place and Lead oxide along with Nitrogen dioxide and Oxygen is produced.

We observe brown fumes due to Nitrogen Dioxide. ($NO_2$)

Equation:

$2Pb(NO_3)_2(s) \frac{heat}{---\ \textgreater \ } 2PbO(s) + 4NO_2(g) + O_2(g)$

Lead nitrate ---> Lead oxide + Nitrogen Dioxide + Oxygen