A solution of caustic soda (NaOH) in water or when fused, conducts an electric current. What is the similarity in these two cases?

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?

To carry out the so-called 'electrolysis of water', sulphuric acid is added to water. How does the addition of sulphuric acid produce a conducting solution?

(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).