Question

1.What difference in the property of two miscible liquids enables their separation by fractional distillation?
2.Why is solution not heated to dryness to get crystals?
3.Give one example each of homogeneous and heterogeneous mixture.
4.Name the apparatus by which mixture of oil and water can be separated.
5.How can we check whether the given soli substance is pure or not?
6.A hard substance produces a tinkling sound when beat. Is it metal or a non- metal?
7.Is brass a mixture or a compound?​

Answer 1

1) their boiling point

2) Most crystalline substances become amorphous or lose their water of crystallization to become anhydrous if it is heated to dryness. Hence, all of its crystals gets removed for this.

3) Sugar solution (homogeneous)

chalk in water (heterogeneous)

4) Separating funnel

5) By checking its melting point. If the solid melts at a constant temp. (which is theoretically prove) in laboratory, it is a pure substance.

OR

By chromatography.

6) Generally all metals are sonorous, i.e. they produce a tinkling sound when hit. But this property is not found in non-metals.Hence, it is a metal.

7) Brass is a mixture of 66% Copper and 34% Zinc.

Answer 2

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