Write the names and formulae of (a) a metal hydride, and (b) a non-metal hydride.

13 A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and colour of the solution ? 14 Which property of copper and aluminium makes them suitable:

(a) For making cooking utensils and boilers?

(b) for making electric wires?

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 ?