Give a reason why -

(a) Alcohol & water form a miscible mixture while oil & water do not.

(b) Boiled water tastes flat.

(c) On opening a bottle of soda the gas escapes out with a 'fizz'.

Give the importance of -

(a) Dissolved minerals & salts

(b) Dissolved air

in water.

Draw a table to differentiate - True solutions, colloidal solutions & suspensions - with respect to :

(i) Type of mixture

(ii) Solute particles in the mixture

Give four examples of each of the above types of solutions i.e. true solution, colloidal solution & suspension. Give a reason why a true solution does not exhibit 'Tyndall effect'.