Which one of the following is non-ideal solution

Benzene + toluene
n-hexane + n-heptane
Ethyl bromide + ethyl iodide
CCl₄ + CHCl₃

AD
CB
CD
AD, CB and CD

Solution

The given vapour pressure graph shows that on mixing two components having vapour pressures p_A and p_B in any ratio, the total vapour pressure of the solution,shown by the line CD, does not show any deviation from ideal behaviour. Lines AD and CB are also do not show any deviation from their expected behaviour but these lines show the individual beheviour of components A and B.

For which of the following parameters the structural isomers C₂H₅OH and CH₃OCH₃ would be expected to have the same values?(Assume ideal behaviour)

Boiling points
Vapour pressure at the same temperature
Heat of vaporization
Gaseous densities at the same temperature and pressure

Solution

Gaseous densities of ethanol and dimethyl ether would be same at same temperature and pressure. The heat of vaporisation, V.P. and b.pts will differ due to H-bonding in ethanol.

All form ideal solution except

C₆H₆ and C₆H₅CH₃
C₂H₆ and C₂H₅I
C₆H₅Cl and C₆H₅Br
C₂H₅I and C₂H₅OH

Solution

C₂H₅I and C₂H₅OH form non-ideal solution.

An ideal solution is formed when its components

have no volume change on mixing
have no enthalpy change on mixing
Both (a) and(b) are correct
Neither(a) nor(b) is correct

Solution

For ideal solution,ΔV_mixing = 0 and ΔH_mixing = 0

The value of P° for benzene is 640 mm of Hg.The vapour pressure of solution containing 2.5 gm substance in 39 gm.benzene is 600 mm of Hg the molecular mass of X is –

65.25
130
40
75

Solution

If all the four following compounds were sold at the same price, which would be cheapest for preparing an antifreeze solutuion for a car radiator?

C₃H₅(OH)₃
C₂H₄(OH)₂
C₂H₅OH
CH₃OH

Solution

18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution is

76.00 torr
752.40 torr
759.00 torr
7.60 torr

Solution

Which of the following liquid pairs shows a positive deviation from Raoult’s law ?

Water - Nitric acid
Benzene - Methanol
Water - Hydrochloric acid
Acetone - Chloroform

Solution

The volume of gas decreases from 500 cc to 300 cc when a sample of gas is compressed by an average pressure of 0.6 atm. During this process 10 J of heat is liberated . The change in internal energy is.

–2.16 J
12.15 J
2.16 J
101.3 J

Solution

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