The boiling point of fuel oil is

The boiling point of diesel is

A. 270 °C to 340 °C

B. 350 °C to 500 °C

C. 500 °C to 600 °C

D. more than 500 °C

The boiling point of petrol is

A. below 20 °C

B. 35 °C to 70 °C

C. 70 °C to 120 °C

D. 170 °C to 250 °C

Process in which metal ions are reduced to free metals is called

A. roasting

B. smelting

C. Bessemerization

D. concentration

Ore of iron is called

A. hematite

B. chalcopyrite

C. bauxite

D. halite

Ore of silicon is called

A. galena

B. zinc blende

C. Cassiterite

D. silica