The amounts of solutes ‘A’, 'B' and ‘C’ in $300$ g of water at $25 ° C$ , $40 ° C$ and $60 ° C$ in their saturated solutions are given below. Identify the true statement among the following:
$25 ° C$ $40 ° C$ $60 ° C$
A $110$ g $90$ g $105$ g
B $140$ g $170$ g $180$ g
C $130$ g $150$ g $140$ g

A, B, and C form precipitates on cooling their respective saturated solutions at $60 ° C$ - $40 ° C$ .

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A and B form precipitates on cooling their respective saturated solutions from $40 ° C$ - $25 ° C$ .

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B and C form precipitates on cooling their respective saturated solutions from $60 ° C$ - $40 ° C$ .

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"A' can form precipitate on cooling its saturated solution at $60 ° C$ - $40 ° C$ , whereas C forms precipitate on cooling its saturated solution at $40 ° C$ - $25 ° C$ .

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Solution

The correct option is D
"A' can form precipitate on cooling its saturated solution at $60 ° C$ - $40 ° C$ , whereas C forms precipitate on cooling its saturated solution at $40 ° C$ - $25 ° C$ .

Explanation of correct option:
(D) "A' can form precipitate on cooling its saturated solution at $60 ° C$ - $40 ° C$ , whereas C forms precipitate on cooling its saturated solution at $40 ° C$ - $25 ° C$ .
While cooling from $60 ° C$ - $40 ° C$ , the solubility of A decreases, and hence precipitate is formed.
For C also the solubility decreases from $40 ° C$ - $25 ° C$ , thus precipitate will be formed.
Explanation of incorrect options:
(A) A, B, and C form precipitates on cooling their respective saturated solutions at $60 ° C$ - $40 ° C$ .
C won't form any precipitates as solubility increases while going from $60 ° C$ - $40 ° C$ .
(B) A and B form precipitates on cooling their respective saturated solutions from $40 ° C$ - $25 ° C$ .
A won't form any precipitates as solubility increases while going from $40 ° C$ - $25 ° C$ .
(C) B and C form precipitates on cooling their respective saturated solutions from $60 ° C$ - $40 ° C$ .
C won't form any precipitates as solubility increases while going from $60 ° C$ - $40 ° C$ .

Hence, the correct option is (D).

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The amounts of solutes ‘A’, 'B' and ‘C’ in 300 g of water at 25°C, 40°C and 60°C in their saturated solutions are given below. Identify the true statement among the following: 25°C40°C60°CA110g90g105gB140g170g180gC130g150g140g