Give a balanced equation for addition of iron to copper [II] sulphate solution. State the change in color seen.

In certain reactions an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in each of the following reactions involving addition of:

(a) Dilute hydrochloric acid to silver nitrate

(b) Iron [II] sulphate to sodium hydroxide

(c) Iron [III] chloride to ammonium hydroxide

(d) Copper [II] sulphate to sodium hydroxide

(e) Lead nitrate to ammonium hydroxide

Give examples of exothermic reactions i.e. heat evolved in each of the following:

(a) reaction between a solid and a liquid

(b) reaction between two gases

Give two examples of exothermic reactions seen in everyday life.