When lead nitrate is heated it decomposes with a cracking sound, a reddish brown gas is liberated and a solid residue is left in the test tube.

Write the balanced chemical equation to describe the changes on decomposition of lead nitrate.

Define double displacement reaction and give one example of each of the following types of this reaction in which
(i) a yellow precipitate is formed
(ii) a black precipitate is formed
(iii) a gas is liberated
(iv) a white precipitated is formed
(v) two other solutions are formed.

Define double displacement reaction and give one example of the following type of the reaction in which a black precipitate is formed.

 Explain the following:

$\mathrm{Cu} + 2{\mathrm{AgNO}}_3 \to \mathrm{Cu}({\mathrm{NO}}_3{)}_2 + 2\mathrm{Ag}$ is a redox reaction.

In the reaction $2\mathrm{Na} + {\mathrm{O}}_2\to 2\mathrm{NaO}$, identify the substance which loses electrons and is oxidized.