Magnetite type of Iron ore contains

1. 80% of pure iron
2. 72% of pure iron
3. 60% of pure iron
4. 40% of pure iron

Iron ore is mainly used for

1. ship building
2. bolts, nails and screws
3. roads and railways
4. all the above

This is an important mineral for making iron and steel

1. copper
2. iron
3. coal
4. manganese

Manganese is used in the manufacture of

1. bolts & nails
2. sponge
3. iron appliances
4. ferromanganese