Write equation for the reaction of:

(a) sodium with oxygen

(b) magnesium with oxygen

18 Name one metal which is stored in kerosene oil. 18 Name one non-metal which is stored under water. 20 Name two metals which are used:

(a) for making electric wires.

(b) for making domestic utensils and factory equipment.

(c) for making jewelry and to decorate sweets.

21 Which metal foil is used for packing some of the medicine tablets ?