Question

2. Which technique is used to purify dirty water?
a, Centrifugation
b. Evaporation
c. Sedimentation
d. Decantation
3.A mixture of salt, sand, oil and water is given, which of these sequence can be used to separate
salt.
a. Decantation -> Filtration - Evaporation
b. Filtration -> Evaporation -> Condensation
c. Filtration -> boiling -> Decantation
d. None of the above.
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Answer 1

Answer:

2 answer is b is your answer

Answer 2

1. Sedimentation

Explanation :-

The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination; and the use of electromagnetic radiation such as ultraviolet light

2. Filtration -> Evaporation -> Condensation

Explanation :-

First by filtration sand can be separated from the mixture of sand, salt and water. Then by evaporation the water will get evaporated leaving behind the salt. The evaporated vapours can be collected and condensed to get water.