Question -
Assertion (A): Molality of solution does not change with change in temperature. Reason (R): Molality is defined as no. of moles of solute per kg of solvent. Which of the following is correct?
Options:
A .  Both A and R are true and R is correct explanation of A
B .  Both A and R are true and R is not a correct explanation of A
C .  A is true but R is false.
D .  A is false but R is true.
Answer: Option B : B Molalitydoesnotchange with change in temperature, because it is defined as no.of.molesofsolutewt.ofsolventinkg . Neither no. of moles nor the wt. of solvent is changing with change in temperature. Hence (b) is the correct option.
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