Question # 1

Chemical reaction of oxygen with other substances is called.

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Oxidation

Reduction

Rusting

None of these

A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is.

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Iron oxide

Iron sulphide

Iron Chloride

Iron Hydride

Compustion is a.

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Physical Change

Chemical change

Thermal change

None of these

What happens to water on heating.

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Evaporates

Condense

Freez

None of these

The temperature at which a liquid's vapour pressure is equal to the external pressure surrounding the liquid is.

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Melting point

Boiling point

Freezing point

Highest temperature.

What are teh products when electric current is passed through water.

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Only steam

Hydrogen and steam

Hydrogen and oxygen

Oxygen and steam

Formation of steam from water is example of.

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Chemical change

Physical Change

Both of these

None of these

Sajeet the one that is different from the otehrs.

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Solubility

Conductance

Oxidation

Coiling of a substance

Freezing of a liquid is a

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Chemical change

Chemicla property

Physical change

None of these

A physical change occurs when.

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Iron rusts

Solution of common salt is heated

A piece of wood burns

Sygar us geated strongly

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