extraction of iron

How to extract aluminium from its ore?

• Electrolysis

• Reduction by carbon

• Oxidation

• Redox reaction

What is the name of the iron ore?

• magnetite

• bauxite

• haematite

• cassiterite

in a hot blast furnace, the hot air is blown into the furnace from the .................

• no hot air

• middle

• top

• bottom

Carbon is in the form of .......

• coke

• diamond

• charcoal

• graphite

The raw materials for extraction of iron are........

• iron ore, coke, limestone, carbon dioxide

• iron ore, coke, limestone

• iron ore, limestone

• iron ore, coke, carbon monoxide

What is the waste gas formed in the blast furnace?

• carbon monoxide

• nitrogen dioxide

• carbon dioxide

• nitrogen monoxide

"Oxygen from the hot air react with carbon to form carbon monoxide at the bottom of blast furnace."

Is this statement correct?

• yes

• no

Oxygen in the hot air react with carbon to form carbon monoxide. what is the use of carbon monoxide?

• no use

• become waste gas

• to reduce iron ore to iron

• to react with impurities

"In the extraction of iron, both carbon and carbon monoxide act as oxidising agent."

Is this statement true or false?

• true

• false

What is limestone?

• calcium oxide

• calcium hydroxide

• calcium sulphate

• calcium carbonate