Assertion :The sum of mole fractions of all the components of a solution is unity. Reason: Mole fraction is a temperature dependent mode of concentration.

Choose the correct option.

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

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

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Mole fraction of A in solution $(x_{A}) = \frac{n_{A}}{n_{A} + n_{B}}$
Mole fraction of B in solution $(x a) = \frac{n_{B}}{n_{A} + n_{B}}$
So,
$x_{A} + x_{B} = \frac{n_{A} + n_{B}}{n_{A} + n_{B}} = 1$

The mols of any substance can be related to its mass using its molar mass, i.e. And so, since the number of particles is independent of temperature, their mass is also independent of temperature.

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