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Titanium is used in the construction of aircrafts and rockets because:

It is light, hard and resistant to corrosion.

It is resistant to corrosion and is not easily attacked by chemicals like chlorine and acids.

It is a good conductor.

It has a high tensile strength and a high melting point.

In the extraction iron from haematite, the limestone also plays a second function due to the fact that:

The carbon dioxide formed when it decomposes, replenishes that formed at the bottom of the furnace as coke reacts with oxygen.

It preserves the iron.

It helps solidifies the iron.

None is correct.

Impure copper is purified or refined by:

Electrolysis, during which the impure copper is made the anode and a piece of pure copper is made the cathode of the electrolytic cell.

Chemical reduction, during which the impure copper is made the anode and a piece of pure copper is made the cathode of the electrolytic cell.

Thermal reduction, during which the impure copper is made the anode and a piece of pure copper is made the cathode of the electrolytic cell.

Electrolysis, during which the impure copper is made the cathode and a piece of pure copper is made the anode of the electrolytic cell.

Iron is used in making farm tools like hoes and cutlasses because:

Its hardness.

Its magnetic properties.

It is hard and malleable.

It high tensile strength.

Titanium is used in building nuclear reactors because:

It is light, hard and resistant to corrosion.

It has a high tensile strength and a high melting point.

It is resistant to corrosion and is not easily attacked by chemicals like chlorine and acids.

It is a good conductor.