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Depression in Freezing Point

AssertionA : ...

Question

Assertion(A) : $N a_{2} S O_{4}$ is soluble in water but $B a S O_{4}$ is insoluble.
Reason(R) :Lattice Energy of $B a S O_{4}$ exceeds its hydration energy.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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B

Both Assertion and Reason are true but Reason is not a correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Both Assertion and Reason are false

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
The lattice energy of sodium sulfate( $N a S O_{4}$ ) is lower than hydration energy. Hence, sodium sulfate is soluble in water. The lattice energy of barium sulfate( $B a S O_{4}$ ) is higher than hydration energy. Hence, barium sulfate is insoluble in water.

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