22 Which method of separation is used to obtain pure salt from a mixture of salt, sand and water?
A boiling then filtering
B evaporating then condensing
C filtering then evaporating
D filtering then sieving

C filtering then evaporating

Explanation:

This is because you will separate salt in filtration and then as salt dissolves in water, so you need to evaporate in order to get it back.

Hope it helps :)

i think it is true since you can test the answer and can use observations to complete it.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.