On decreasing the temp. From 393K to 303K,which of the given substances will separate out in maximum amount?
(A)W
(B)Y
(C)X
(D)Z

Ans- On decreasing the temperature from 393 k to 303 K, substance Y will separate out in maximum.
Explanation:

• More is the solubility of a substance in water more readily it will dissociate into ions. Hence, then it will be difficult to separate it out. So, when solubility of given substances increases at 393 kelvin then dissociation also increases.

• Hence, substance X cannot be easily separated out. On the other hand, a substance with low solubility will not dissociate into ions. Hence, it will remain in its solid state. Therefore, it can be easily separated out when there will occur a decrease in temperature.

• This means that the substance Y on decreasing the temperature from 393 K to 303 K, will separate out in maximum.