CBSE
Multiple Choice QuestionsOf the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?
KCl
C6H12O6
Al2(SO4)3
Al2(SO4)3
In Duma's method for estimation of nitrogen 0.25 g of an organic compound gave 40 ml of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm the percentage of nitrogen in the compounds is,
17.36
18.20
16.76
15.76
Which of the following statements about the composition of the vapour over an ideal 1:1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 250C.
(Given, vapour pressure data at 250C benzene = 12.8 kPa, toluene = 3.85 kPa)
The vapour will contain a higher percentage of toluene
The vapour will contain equal amounts of benzene and toluene
Not enough information is given to make a prediction
Not enough information is given to make a prediction
A 1000C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be
1000C
1020C
1030C
1030C
The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be
5.4 g
10.8 g
54.0 g
54.0 g
The boiling point of 0.2 mol kg-1 solution of X in water is greater than the equimolal solution of Y in water. Which one of the following statements is true is this case?
X is undergoing dissociation in water
The molecular mass of X is greater than the molecular mass of Y.
Molecular mass of X is less than the molecular mass of Y,
Molecular mass of X is less than the molecular mass of Y,
A mixture of gases contains H2 and O2 gases in the ratio of 1:4 (w/w).what is the molar ratio of the two gases in the mixture?
1:4
4:1
16:1
16:1
Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25oC are 200 mmHg and 41.5 mmHg respectively, Vapour pressure of the solution obtained by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at the same temperature will be
(molecular mass of CHCl3= 119.5 u and molecular mass of CH2Cl2 = 85 u)
173.9 mmHg
615.0 mmHg
347.9 mmHg
347.9 mmHg
which is one not equal to zero for an ideal solution?
Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of Al2(SO4)3 (if all are 100% ionised)?
K2SO4
K3[Fe(CN)6]
Al(NO3)3
Al(NO3)3
