Corrosion -G10

Corrosion is defined as eating aup of atmospheric gases like _________ to form their oxides, hydroxide, carbonates, etc

• Oxygen, nitrogen, hydrogen

• Oxygen, water, carbon dioxide

• Oxygen, Argon, only

• Oxygen only

Corrosion of copper is due to

• Moisture

• Hydrogen gas

• Carbon dioxide and moisture

• Hydrogen sulphide

Corrosion of silver is due to

• Moisture

• Hydrogen gas

• Carbon dioxide and moisture

• Hydrogen sulphide

Rusting of iron is an example of

• Rapid combustion

• Spontaneous combustion

• Explosion

• Slow combustion

Galvanisation is a method of protecting iron from rusting by coating with a thin layer o

• Gallium

• Zinc

• Aluminium

• Silver

Galvanisation uses a metal which is _____ reactive than Iron so that .......

• More ; so that it reacts more readily instead of iron

• Less ; so that it doesnt react with iron

Which of these methods of preventing rusting cuts off contact with air. [Tick all that are applicable]

• Galvanisation

• Painting

• Oiling or greasing

• Cold temperatures

• Anodising

Where will rusting be more prominent?

• Pondicherry

• Aurangabad

• Ladakh

• All of these

Stainless steel doesn't rust. The method used to prevent rusting here was

• Galvanisation

• Electroplating

• Alloying

• Polishing

Silver turns black on corrosion due to formation of

• Silver hydroxide

• Silver dioxide

• Silver nitrate

• Silver sulphide