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?

Copper sulphate solution is electrolysed using a platinum cathode and carbon anode. Study the diagram given below and answer the following questions:

(a) Give the names of the electrodes A and B.

(b) Which electrode is the oxidising electrode?

(a) Choosing only words from the following list, write down the appropriate words to fill in the blanks (i) to (v) below:

anions , anode, cathode, cations , electrode, electrolyte, nickel , voltameter.

The electroplating of an article with nickel requires an (i) …………… which must be a solution containing (ii) …………… ions. The article to be plated is placed as the (iii) …………… of the cell in which the plating is carried out. The (iv) …………… of the cell is made from pure nickel. The ions that are attracted to the negative electrode and discharged are called (v) ……………

(b) When a molten ionic compound is electrolysed, the metal is always formed at …………… and the non-metal is formed at ……………

(c) Electrolysis of acidulated water is an example of …………… (Reduction/ oxidation/ redox reaction/synthesis).

Explain the following :

A solution of cane sugar does not conduct electricity, but a solution of sodium chloride is a good conductor.