7.3 Corrosion reactions

A corrosion reaction is a chemical reaction that happens .....................................

• inside the metal

• on the surface of a metal

Which of the following is NOT a useful chemical reaction mentioned in the text?

• Corrosion

• Cement industry

• Making medicines

• Making fertilisers

What is the name of the compound formed due to iron corrosion called?

• Iron sulfide

• Iron oxide

• Iron carbonate

• Hydrated Iron Oxide

What is the name of the compound formed due to copper corrosion called?

• Hydrated Copper Oxide

• Copper carbonate

• Copper sulfide

• Copper oxide

Rust in iron colour is .....................

• Black

• Green

• Reddish brown

Verdigris (patina) in copper colour is .....................

• Black

• Green

• Reddish brown

Patina in Silver colour is .....................

• Black

• Green

• Reddish brown

What is the name of the compound formed due to silver corrosion called?

• Hydrated Silver Oxide

• Silver carbonate

• Silver sulfide

• Silver oxide

Forms on the surface.

It is soft and crumbly.

It easily comes off which leaves more iron exposed and ready to rust.

These are properties of:

• Iron rust.

• Copper verdigris.

• Silver verdigris.

Which metal does not react with oxygen or water at 20°C?

• Copper

• Silver

• Iron