Question # 1

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

Sajeet the one that is different from the otehrs.

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Solubility

Conductance

Oxidation

Coiling of a substance

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

On heating sugar changes into

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Carbon

Water

Both carbon and water

Heat

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

What happens to water on heating.

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Evaporates

Condense

Freez

None of these

Compustion is a.

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Physical Change

Chemical change

Thermal change

None of these

Original colur or Nichrome wire is.

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Silver grey

Red hot

White hot

None of these

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