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 ?

11 What name is given to those metal oxides which show basis as well as acidics behavior ? 12 Name two metals which form amphoteric oxides. 14 Which property of copper and aluminium makes them suitable:

(a) For making cooking utensils and boilers?

(b) for making electric wires?

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