CHEMISTRY [1 Mark Question Answer]

Water is a compound because it is composed of two different elements, hydrogen and oxygen which cannot be separated by physical methods. They can be separated only by chemical methods

Air is a mixture and not a compound because of the following reasons: Air can be separated into its constituents such as oxygen, nitrogen etc. by fractional distillation of liquid air. Air shows the properties of all the gases present in it.

Four compounds which can be termed as pure substance are water (H2O), carbon dioxide (CO2), methane (CH4), sodium nitrate (NaNO3).

Four elements which can be termed as pure substance are carbon, oxygen, hydrogen and iron

A mixture is formed when atoms or molecules of the same or different particles combine with each other physically in any ratio.

Pure substances are defined as substances that are made of only one type of atom or only one type of molecule.

Sulphur is removed from the mixture of iron and sulphur by magnet.

The constituents of a mixture are present in an indefinite ratio.

Pure water is obtained from seawater by the combined process of distillation.

Sulphur is removed from the mixture of iron and sulphur by magnet.

Cheese is removed from the curdled milk by the process of filtration.