The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non-volatile and non-electrolyte solid, weighing 2. 175 g is added to 39.08 g of benzene. If the vapour pressure of the solution is 600 mm Hg, what is the molecular weight of solid substance?
49.50
50.60
69.40
79.82
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
Out of the following which is not a colligative property?
Lowering of vapour pressure
Elevation of boiling point
Osmotic pressure
Freezing point
Which one is a colligative property?
Boiling point
Vapour pressure
Which of the following colligative properties can provide molar mass of proteins (or polymers or colloids) with greatest precision?
Depression of freezing point
Relative lowering of vapour pressure
A 500g of tooth paste sample has 0.4g fluoride concentration. The concentration of fluoride in ppm is
800
400
600
250
1.00 g of a non- electrolyte solute (molar mass 250 g 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
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
NaCl
Al(NO3)3
Na2SO4
Which of the following 0.10 M aqueous solutions will have the lowest freezing point?
C5H10O5
KI
C12H22O11
Molality is the most inconvenient way of expressing concentration because it
Has no unit
Is very difficult to find out
Involves difficult calculations
Involves the measurement of weight of liquids
