The metals zinc and tin are present in the alloy

1. Solder
2. Brass
3. Bronze
4. Duralumin

The organic compound prepared when acetylene reacts with excess of hydrogen:

1. Ethane
2. Ethene
3. Methane
4. Propane

The alkaline earth metal of period 3 is:

1. Mg
2. Ca
3. Na
4. K

During electrolysis of an aqueous solution of sulphuric acid between platinum electrodes, two types of anions migrate towards the anode but only one of them is discharged.

(a) Name the two anions.

(b) Name the main product of the discharge of anion at the anode and write the anode reaction.

(c) Name the product at the cathode and write the reaction.

(d) Do you notice any change in colour? State why?

(e) Why this electrolysis is considered as an example of catalysis?