Q34 of 44 Page 17

Can a solution be heterogeneous?

No, a solution cannot be heterogeneous. A solution is a homogeneous mixture that is made up of two or more substances. It has a uniform composition. The air we breathe is an example of a homogeneous solution.

Though colloidal solutions are heterogeneous in nature, they appear to be homogeneous.


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34

Under which category of mixtures will you classify alloys and why?

 34

A solution is always a liquid. Comment.

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Iron filings and sulphur were mixed together and divided into two parts, ‘A’ and ‘B’. Part ‘A’ was heated strongly while Part ‘B’ was not heated. Dilute hydrochloric acid was added to both the Parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?

 36

A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in Fig. 2.3. The filter paper was removed when the water moved near the top of the filter paper.

(a) What would you expect to see, if the ink contains three different coloured components?


(b) Name the technique used by the child.


(c) Suggest one more application of this technique.