A) N, m
B) m, x
C) m, N
D) F, N
Correct Answer: B
Solution :
Molality (m) and mole-fraction (x) are independent of volume of solution, hence, also independent of the temperature. Their formula is based on only weights. \[m=\frac{\text{weight}\,\text{of}\,\text{solute}}{\text{molecular}\,\text{weight}\,\,\text{ }\!\!\times\!\!\text{ }\,\text{weight}\,\text{of}\,\text{solvent}}\] and \[\underset{\text{(of}\,\text{solute)}}{\mathop{x}}\,=\frac{\omega \text{/}m}{\frac{\omega }{m}+\frac{\omega }{M}}=\frac{\omega M}{\omega M+\omega m}\]
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