Question

Question 6. Purity of a solid substance can be checked by its:
ay Boiling point b) Melting point c) Solubility in water
d) Solubility in alcohol
Question 7. A mixture of ethanol and water can be separated by:
a) Filtration b) Decantation c) Fractional distillation
d) Sublimation
Question 8. Salt can be obtained from sea water by:
a) Filtration b) Decantation c) Evaporation d) Sublimatic​

Answer 1

Answer:

6. b)

7. c)

8. c)

Explanation:

6. Every solid substance has a purity in melting point.

7. To separate a mixture of alcohol (ethanol) and water, you can use a process known as fractional distillation. This technique relies on the fact that the compounds in the mixture have different boiling points.

8. Common salt is obtained from sea-water by the process of evaporation. Sea water is trapped in large, shallow pools and allowed to stand there. The sun's heat evaporates the water slowly and common salt is left behind.

Answer 2

Answer:

6. b)

7. c)

8. c)