2 gram of Lead Nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. Now answer the following

(A) State the colour of the fumes evolved and the Residue left.

(B) Name the type of chemical reaction that has taken place stating its balanced chemical equation

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Solution

Part (a) Colour of fume and residue
Lead nitrate before heating: White
Color of lead nitrate after heating: Yellow due to Lead oxide
Color of fumes: Reddish-brown due to nitrogen dioxide

Part (b): Type of chemical reaction
The decomposition of lead nitrate $(P b (N O_{3})_{2})$ takes place when heat is provided. So, this is an example of a thermal decomposition reaction.
Thermal decomposition of Lead nitrate leads to the formation of Lead oxide $(P b O)$ , Nitrogen dioxide $(N_{2})$ and oxygen $(O_{2})$ .
The balenced chemical reaction can be represented as:
$2 P b (N O_{3})_{2} (s) Δ - \to 2 P b O (s) + 4 N O_{2} (g) + O_{2} (g)$

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2 gram of Lead Nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. Now answer the following (A) State the colour of the fumes evolved and the Residue left. (B) Name the type of chemical reaction that has taken place stating its balanced chemical equation

2 gram of Lead Nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. Now answer the following

(A) State the colour of the fumes evolved and the Residue left.

(B) Name the type of chemical reaction that has taken place stating its balanced chemical equation