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Third Law of Thermodynamics

Assertion A: ...

Question

Assertion (A): CsI is least soluble of all the caesium halides in water.
Reason (R) : It is due to low 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 B Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In CsI, both cation and anion are large in size. They are hydrated to a small extent. Hence, they have lower solubility in water than other alkali metal halides.

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Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
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