M is a metal above hydrogen in the activity series and its oxide has the formula M₂O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context answer the following:

(a) What kind of combination (bond) exists between M and O?

(b) How many electrons are there in the outermost shell of M?

In electrolysis of molten lead bromide

(a) State the reaction taking place at the cathode.

(b) Which electrode: anode or cathode is the oxidising electrode ? Why?

Name the following:

(a) A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminium.

(b) The ore of zinc containing its sulphide.

Prepare: Lead sulphate from lead carbonate.