Question # 1

Zince oxide is ............... solid substances.

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Red

White

Yellow

Blue

Select all that happen during a chemicla change.

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A temporary chagne occurs.

Composition of the substanes is changed.

Propertis of the sbstances are changed.

New substances with different properties are formed.

Freezing of a liquid is a

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Chemical change

Chemicla property

Physical change

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

What happens to water on heating.

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Evaporates

Condense

Freez

None of these

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

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

Product fo combustion is.

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C

O2

CO2

All 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.

Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as.

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Combustion

Rusting

Tarmishing

Dehydration

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