Q3 of 44 Page 12

A mixture of sulphur and carbon disulphide is

A mixture of sulphur and carbon disulphide is heterogeneous and shows Tyndall effect.


A mixture of sulphur and carbon disulphide is a heterogeneous colloid* and shows Tyndall effect. The Tyndall effect is scattering of light by particles in a colloid. Colloids appear to be homogeneous but they are actually heterogeneous in nature. Milk and fog are some other examples of colloids.

*Colloids are the substances that have some other substances dispersed in the solution and these particles do not settle down at the bottom.

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1

Which of the following statements are true for pure substances?

(i) Pure substances contain only one kind of particles.


(ii) Pure substances may be compounds or mixtures.


(iii) Pure substances have the same composition throughout.


(iv) Pure substances can be exemplified by all elements other than nickel.

 2

Rusting of an article made up of iron is called

 4

Tincture of iodine has antiseptic properties. This solution is made by dissolving

 5

Which of the following are homogeneous in nature?

(i) ice


(ii) wood


(iii) soil


(iv) air