1.00g of a non- electrolyte solute (molar mass 250g mol-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, kf of benzene is 5.12 K kg mol-1, the freezing point of benzene will be lowered by.
0.4 K
0. 3 K
0.5 K
0. 2K
The vapour pressure of benzene at a certain temperature is 640 mmHg. A non-volatile and non-electrolyte solid, Weighing 2. 175g is added to 39.08g of benzene. If the vapour pressure of the solution is 600 mmHg, what is the molecular weight of solid substance?
49.50
50.60
69.40
79.82
A 500g of tooth paste sample has 0.4g fluoride concentration. The concentration of fluoride in ppm is______________________
800
400
600
250
Which of the following aqueous solutions has minimum freezing point?
0.01 m NaCI
0.005 m MgI2
0.005 m C2H5OH
0.005 m MgSO4
During osmosis, flow of water through a semi permeable membrane is
From solution having higher concentration only
From both sides of semi-permeable membrane with equal flow rates
From both sides of semi-permeable membrane with unequal flow rates
From solution having lower concentration only
If 0.15 g of solute, dissolved in 15 g of solvent, is boiled at a temperature higher by 0.216oC, than that of the pure solvent, the molecular weight of the substance is ______________(molal elevation constant for the solvent is 2.16oC).
1.01
10
10.1
100
Which one of the following salts will have the same value of van't Hoff factor (i) as that of K4[Fe(CN)6]?
Al2(SO4)3
NaCI
AI(NO3)3
Na2SO4
A 0.0020 m aqueous solution of an ionic compound Co(NH3)5(NO2)CI freeze at -0.00732oC. Number of moles of ions inwhich 1 mole of ionic compound produces on being dissolved in water will be (kf = -1.86oC/m)
2
3
4
1
In cold countries, ethylene glycol is added to water in the radiators of cars during winter. This results in_______________________
Lowering the freezing point
Reducing the specific heat
Reducing the viscosity
Making water a better conductor of electricity
According to Raoult's law, relative lowering of vapour pressure of a solution is equal to
moles of solute
moles of solvent
mole fraction of solute
mole fraction of solvent
