(i) If 150 cc of gas A contains X molecules, how many molecules of gas B will be present in 75 cc of B?

The gases A and B are under the same conditions of temperature and pressure.

(ii) Name the law on which the above problem is based.

Name the main component of the following alloys:

(i) Brass

(ii) Duralumin

(i) Name the most common ore of the metal aluminum from which the metal is extracted. Write the chemical formula of the ore.

(ii) Name the process by which impure ore of aluminum gets purified by using concentrated solution of an alkali.

(iii) Write the equation for the formation of aluminum at the cathode during the electrolysis of alumina.

A compound X (having vinegar like smell) when treated with ethanol in the presence of the acid Z, gives a compound Y which has a fruity smell.

The reaction is:

$\text{C}$2\text{H}5\text{OH} + \text{X} \xrightarrow{\text{Z}} \text{Y} + \text{H}_2\text{O}

(i) Identify Y and Z.

(ii) Write the structural formula of X.

(iii) Name the above reaction.