Solutions Quiz 2 – Punjab Meritorious School Preparation Portal

Welcome to your 29th July Solutions Quiz 2 CBT TEST

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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

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

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

Gram per million

Milligram percent

Microgram percent

Parts per million

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

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

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

0.009

0.018

0.027

0.036

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

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

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

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