Question # 1

A gas produced on heating solid potassium chlorate is.

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Hydrogen

Carbon dioxide

Oxygen

Methane

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

Freezing of a liquid is a

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Chemical change

Chemicla property

Physical change

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

On heating sugar changes into

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Carbon

Water

Both carbon and water

Heat

Original colur or Nichrome wire is.

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Silver grey

Red hot

White hot

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

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

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Red

White

Yellow

Blue

Compustion is a.

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Physical Change

Chemical change

Thermal change

None of these

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General Science 7th Class English Medium Chapter 5 Online Test MCQs With Answers

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