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Molality

Assertion :A ...

Question

Assertion :A one molal solution prepared at $20^{\circ} C$ will retain the same molality at $100^{\circ} C$ , provided there is no loss of solute or solvent on heating. Reason: Molality is independent of temperature.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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C

Assertion is correct but Reason is incorrect

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D

Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$Molality = \frac{Number of moles of solute}{Mass of solvent in kg}$
A one molal solution prepared at $20^{\circ} C$ will retain the same molality at $100^{\circ} C$ , provided there is no loss of solute or solvent on heating.
$Because$
Molality is independent of temperature as it does not contains volume component. It contains only mass components which are independent of temperature.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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