Question

Consider the following statements and arrange in the order of true/false as given in the codes.
$S_1:$ The lowering of vapour pressure of a solvent is equal to mole fraction of the solute.
$S_2$: Van't Hoff factor $=\frac{\text{Normal Colligative Property}}{\text{Observed Colligative Property}}$.
$S_3$: 0.1 M aqueous $NaCl$ & 0.1 M aqueous sugar solutions are isotonic.
$S_4$: Vapour pressure of a solvent decreases with decreasing temperature.

• A. $FFFT$
• B. $TTFF$
• C. $FFTT$
• D. $TTTT$

Answer 1

The correct option is A $FFFT$

The relative lowering of vapour pressure of a solvent is equal to mole fraction of the solute.
The van't Hoff factor is the ratio of observed colligative property to normal colligatve property.
$S_2:i=\frac{\text{observed colligative property}}{\text{normal colligative property}}$
0.1 M aqueous $NaCl$ & 0.1 M aqueous sugar solutions are not isotonic as one molecule of $NaCl$ on ionization gives two ions whereas sugar molecule does not undergo ionization.
As the temperature decreases, the vapour pressure of solvent decreases.