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    CBSE

    Subject

    Chemistry
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    NEET Chemistry : Solutions

    Multiple Choice Questions

    91.

    A mixture of two miscible liquids A and B is distilled under equilibrium conditions at 1 atm pressure. The mole fraction of A in solution and vapour phase are 0.30 and 0.60 respectively. Assuming ideal behaviour of the solution and the vapour, calculate the ratio of the vapour pressure of pure A to that of pure B.

    • 4.0

    • 3.5

    • 2.5

    • 1.85

    Answer
    • 92.

    If two substances A and B have PA° : PB° = 1 : 2 and have mole fraction in solution 1 : 2 then mole fraction of A in vapours :

    • 0.33

    • 0.25

    • 0.52

    • 0.2

    Answer
    • 93.

    To a 25 mL H2O2 solution, excess of acidified solution of Kl was added. The iodine liberated required 20 ml of 0.3 N Na2S2O3 solution. The volume strength of H2O2 solution is

    • 1.344 g/L

    • 3.244 g/L

    • 5.4 g/L

    • 4.08 g/L

    Answer
    • 94.

    Assertion : A non volatile solute is mixed in a solution then elevation in boiling point and depression in freezing point both are 2 K.

    Reason : Elevation in boiling point and depression in freezing point both depend on melting point of non-volatile solute.

    • If both assertion and reason are true and reason is the correct explanation of assertion

    • If both assertion and reason are true but reason is not the correct explanation of assertion

    • If assertion is true but reason is false

    • If both assertion and reason are false.

    Answer
    • 95.

    1 mol each of the following compounds is dissolved in 1L of solution. Which will have the largest ∆Tb value?

    • HF

    • HCl

    • HBr

    • HI

    Answer
    • 96.

    The mass of glucose that should be dissolved in SO g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is :

    • 1 g

    • 3 g

    • 6 g

    • 18 g

    Answer
    • 97.

    For a dilute solution, Raoult's law states that

    • the relative lowering of vapour pressure is proportional to the amount of solute in solution

    • the relative lowering of vapour pressure is equal to the mole fraction of solute

    • the lowering of vapour pressure is equal to the mole fraction of the solute

    • the vapour pressure of the solution is equal to the mole fraction of the solvent.

    Answer
    • 98.

    A 0.1 molal solution of an acid is 4.5% ionized. Calculate freezing point. (molecular weight of the acid is 300). Kf = 1.86 K mol-1 kg.

    • -0.194°C

    • 2.00°C

    • 0°C

    • -0.269°C

    Answer
    • 99.

    Which is not a colligative property ?

    • Refractive index

    • Lowering of vapour pressure

    • Depression in freezing point

    • Elevation in boiling point

    Answer
    • 100.

    Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations .This is because :

    • benzoic acid is an organic solute

    • benzoic acid has higher molar mass than benzene

    • benzoic acid gets associated in benzene

    • benzoic acid gets dissociated in benzene

    Answer
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