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2. Is Matter Around Us Pure
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Q13 of 44 Page 14

The ‘sea-water’ can be classified as a homogeneous as well as a heterogeneous mixture. Comment.

The ‘sea-water’ can be a homogeneous mixture as it contains salts and water only.

It can also be a heterogeneous mixture as it contains other insoluble components such as mud, decayed plant, calcium carbonate shells along with salts and water.


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11

Which of the tubes in Fig. 2.1 (a) and (b) will be more effective as a condenser in the distillation apparatus?

12

Salt can be recovered from its solution by evaporation. Suggest some other technique for the same?

14

While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C). What technique can be employed to get back the acetone? Justify your choice.

15

What would you observe when

(a) a saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature.


(b) an aqueous sugar solution is heated to dryness.


(c) a mixture of iron filings and sulphur powder is heated strongly.

Questions · 44
2. Is Matter Around Us Pure
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