CBSE
Multiple Choice QuestionsWhich of the following aqueous solution should have a highest boiling point?
1.0 M NaOH
1.0 M Na2SO4
1.0 M NH4NO3
10 MKNO3
The volume of water to be added to 100 cm3 of 0.5 NH2SO4 to get decinormal concentration is
100 cm3
450 cm3
500 cm3
400 cm3
Solid NaHCO3 will be neutralised by 40.0 mL of 0.1 M H2SO4 solution. What would be the weight of solid NaHCO3 in gram?
0.672 g
6.07 g
17 g
20 g
For an ideal binary liquid solution with in which relation between Xx (mole fraction of X in liquid phase) and Yx ( mole fraction of Y in liquid and vapour phase respectively.
Xx > YX
Xx = Yx
XX, YX, XY and YY cannot be correlated
In an experiment, addition of 4.0 mL of 0.005 M BaCl2 to 16.0 mL of arsenious sulphide sol just causes complete coagulation in 2 h. The flocculating value of the effective ion is
Ba2+, 1.0
Ba2+, 2.0
Cl-, 1.0
Cl-, 2.0
A solution with negative deviation among the following is
ethanol-acetone
chlorobenzene-bromobenzene
chloroform-acetone
benzene-toluene
Combustion of glucose takes place according to the equation.
C6H12O6 + 6O2 → 6CO2 + 6H2O
Δ = - 72 k-cal
The energy required for combustion of 1.6 g of glucose is
0.064 kcal
0.64 kCal
6.4 kcal
64 kcal
The aqueous solution of an unknown sodium salt gives the following reactions.
I. It decolourises a solution of iodine in potassium iodide.
II. It gives white turbidity with dil.HCl solution.
III. It gives a white precipitate with AgNO3 solution which changes colours and finally becomes black on standing.
The unknown sodium salt is
Sodium thiosulphate
sodium bisulphite
sodium sulphite
sodium sulphide
Consider the following solutions,
A = 0.1 M glucose,
B = 0.05 M NaCl,
C = 0.05 M BaCl2
D = 0.1 M AlCl3
Which of the following pairs is isotonic?
A and B
A and D
A and C
B and C
when the heat of reaction at constant pressure is -2.5 x 103 cal can entropy change is 7.4 cal deg-1 at 25oC, the reaction is predicted as
reversible
Spontaneous
non -spontaneous
Irreversible
