Name one metal which is stored in kerosene oil.

16 Name the metal which has been placed:

(a) at the bottom of the reactivity series

(b) at the top of the reactivity series.

(c) just below copper in the reactivity series

17 Which of the two metals is more reactive: copper or silver ? 18 Name one non-metal which is stored under water. 19 Write equation for the reaction of:

(a) sodium with oxygen

(b) magnesium with oxygen