Which of the following statement is true?
a) Molarity is the no. of moles of solute dissolved per litre of solvent
b) The molarity and normality of a solution of sodium carbonate are same
c) Molality (m) of a solution is defined as the number of moles of solute dissolved is 1000 gm of solution
d) The ratio of mole fraction of solute and solvent is in the ratio of their respective moles.

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b & c

Only d

a & c

a & b

answer is D.

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Detailed Solution

a) molarity is the number of moles of solute dissolved per litre of solution.

b) for sodium carbonate, normality is twice to its molarity. Valency factor of sodium carbonate = 2.

c) molality is the number of moles of solute dissolved in 1000gm of solvent.

$d) \frac{mole fractionof solute}{mole fractionof solvent} = \frac{no.of moles of solute}{no.of moles of solvent}$

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