Assertion :One molar aqueous solution has always higher concentration than one molal. Reason: The molality of a solution depends upon the density of the solution whereas molarity does not.

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

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

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Assertion is correct but Reason is incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Assertion and Reason are incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
We know that,
$M o l a r i t y = \frac{m o l e s o f s o l u t e}{V o l u m e o f s o l u t i o n i n l i t r e s}$
& $M o l a l i t y = \frac{m o l e s o f s o l u t e}{M a s s o f s o l v e n t i n K g}$
$∴ \frac{M o l a r i t y}{M o l a l i t y} = \frac{M a s s o f s o l v e n t i n K g}{V o l u m e o f s o l u t i o n i n l i t r e s}$
$=\dfrac {mass\ of
solvent\ in\ grams \times 10^{-3}}{Volumes\ of\ solution\ in\ ml \times 10^{-3}}$
$= \frac{m a s s o f s o l v e n t i n g a s e s}{V o l u m e o f s o l u t i o n i n g a s e s}$
for aqueous solution, $d e n s i t y = \frac{m a s s o f s o l u t i o n}{V o l u m e o f s o l u t i o n} = 1$
$∴ \frac{m a s s o f s o l v e n t}{v o l u m e o f s o l u t i o n} < 1 ∴ M o l a r i t y < M o l a l i t y$
$∴$ statement $I$ is correct.

Suggest Corrections

Similar questions

Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

Join BYJU'S Learning Program