Question

2g 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 takes place stating its balanced chemical equation.

Answer 1

(a) Brown coloured fumes of `NO_(2)` gas are evolved , residue left is solid white lead oxide
(b) It is a thermal decomposition reaction.
`2Pb(NO_(3))_(2) overset("Heat")to 2PbO+4NO_(2) uarr "(Brown fumes)" +O_(2) uarr`