Name one non-metal which is stored under water.

17 Which of the two metals is more reactive: copper or silver ? 18 Name one metal which is stored in kerosene oil. 19 Write equation for the reaction of:

(a) sodium with oxygen

(b) magnesium with oxygen

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.