Show on a diagram the transfer of electrons between the atoms in the formation of MgO. Write symbols of cation and anion present in MgO.

Differentiate between metals and non-metals on the basis of their chemical properties.

Give reason for the following:

(a) Aluminium oxide is considered as an amphoteric oxide.

(b) Ionic compounds conduct electricity in molten state.

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in the figure here.

(a) What will be the action of gas on:

(i) dry litmus paper ?

(ii) moist litmus paper?

(b) Write a balanced chemical equation for the reaction taking place.

Give reasons:

(a) Platinum, gold and silver are used to make jewellery

(b) Sodium, potassium and lithium are stored under oil.

(c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.

(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.