Question

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Osmolarity is affected by the volumes of the various solutes in the solution, while osmolality is not.
Reason (R) : The osmolarity is the no. of osmoles per kilogram of the solvent whereas the osmolality is the no. of osmoles per litre of the solution.
In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

A simple mnemonic to never mix these up:
OsmolaRity = per LitRe (Volume).
OsmolaLity = per kiLogram (Mass).
Clinical labs prefer measuring osmolality because it is temperature-independent!

Answer 1

The Correct Option is C