Question

A colour less lead salt, when heated, produces a yellow residue and brown fumes .
A. Name the lead salt.
B. Name the brown fumes .
C. Write the chemical equation of the reaction involved.

Answer 1

The salt is lead nitrate and the fumes are of nitrogen gas. It is the characteristic property of nitrogen to produce brown fumes. The yellow residue is of lead oxide.
Reaction required is:

Pb(No3)2 is heated to give PbO +No2+O2

Answer 2

the salt is lead nitrate

the brown fumes is nitrogen dioxide gas

2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

above the arrow delta should be written