Solutions Quiz 2 – Punjab Meritorious School Preparation Portal

Welcome to your 29th July Solutions Quiz 2 CBT TEST

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When a solute is present in trace quantities the following expression is used

Gram per million

Milligram percent

Microgram percent

Parts per million

5 ml of N HCl, 20 ml of N/2 H₂SO₄ and 30 ml of N/3 HNO₃ are mixed together and volume made to one litre. The normality of the resulting solution is

Vapour pressure of benzene at 30 °C is 121.8 mm Hg. When 15 g of a non-volatile solute is dissolved in 250 g of benzene its vapour pressure decreased to 120.2 mm Hg. The molecular weight of the solute (Mo. wt. of solvent = 78)

356.2

456.8

530.1

656.7

The vapour pressure of two liquids ‘P’ and ‘Q’ are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be

72 torr

140 torr

68 torr

20 torr

The vapour pressure of pure benzene at 25 °C is 640 mm Hg and that of solution of solute A is 630 mm Hg. The mo lality of solution is –

0.2 m

0.4 m

0.5 m

0.1 m

Which of the following statements, regarding the mole fraction (x) of a component in solution, is incorrect?

0 ≤ x ≤ 1

x ≤ 1

x is always non-negative

None of these

On adding a solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is :

0.25

0.75

0.50

0.33

The mole fraction of the solute in one molal aqueous solution is:

0.009

0.018

0.027

0.036

The statement “If 0.003 moles of a gas are dissolved in 900 g of water under a pressure of 1 atmosphere, 0.006 moles will be dissolved under a pressure of 2 atmospheres”, illustrates

Dalton’s law of partial pressure

Graham’s law

Raoult’s law

Henry’s law

Formation of a solution from two components can b considered as

(i) Pure solvent → separated solvent molecules, ∆H₁

(ii) Pure solute → separated solute molecules, ∆H₂

(iii) Separated solvent & solute molecules → Solution,

∆H₃

Solution so formed will be ideal if

〖∆H〗_soln=〖∆H〗_3-〖∆H〗_1-〖∆H〗_2

〖∆H〗_soln=〖∆H〗_1+〖∆H〗_2+〖∆H〗_3

〖∆H〗_soln=〖∆H〗_1+〖∆H〗_2-〖∆H〗_3

〖∆H〗_soln=〖∆H〗_1-〖∆H〗_2-〖∆H〗_3

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