Question

1 An ore of lead is ---------- 2 corrosion of iron can be prevented by ----------- 3 oxide responsible for acid rain is/are ------------- 4 which metal will not replace copper from its salt solution?

Answer 1

1 ) an ore of lead is lead Sulphide ( PbS )
2) corrosion of iron can be prevented by applying a layer of zinc on iron 
3) oxide of sulphur and nitrogen is responsible for acide rain 
4 )gold will not replace copper from its salt solution