Practice Test For 10+2 Board Examination- Chemistry

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Maharishi Markandeshwar (Deemed to be University), Mullana- Ambala, Haryana

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The molality of pure water is

1 point

(d) 60.5

(a) 55.5

(b) 50.5

Clear selection

Which of the following statements is false?

1 point

(а) Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point.

(b) The osmotic pressure of a solution is given by the equation π = CRT (where C is the molarity of the solution).

(c) Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose isBaCl2 > KCl > CH3COOH > sucrose.

(d) According to Raoult’s law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution.

Clear selection

The number of moles of NaCl in 3 litres of 3M solution is

1 point

(a) 3

(b) 9

(d) 1

Clear selection

4L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is

1 point

(a) 0.004

(b) 0.008

(d) 0.016

Clear selection

Low concentration of oxygen in the blood and tissues of people living at high altitude is due to _________

1 point

(a) low temperature

(b) low atmospheric pressure

(d) both low temperature and high atmospheric pressure

Clear selection

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?

1 point

(a) Methanol and acetone.

(b) Chloroform and acetone.

(d) Phenol and aniline

Clear selection

Which of the following aqueous solutions should have the highest boiling point?

1 point

(a) 1.0 M NaOH

(b) 1.0 M Na2SO4

(d) 1.0 M KNO3

Clear selection

In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M MgCl2 solution is _________ .

1 point

(a) the same

(b) about twice

(d) about six times

Clear selection

An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because ________.

1 point

(a) it gains water due to osmosis.

(b) it loses water due to reverse osmosis.

(d) it loses water due to osmosis.

Clear selection

Which has the highest freezing point?

1 point

(a) 1 M glucose

(b) 1 M NaCl

(d) 1 M AlF3

Clear selection

Which of the following is correct.

1 point

(a) KJJ increases with increase in temperature (KH is Henry’s law constant).

(b) Solubility of gas in liquid decreases with increases in temperature.

(d) Solubility of gas in liquid increases with increase in temperature.

Clear selection

Benzoic acid, when dissolved in benzene, which of the following is correct.

1 point

(a) The benzoic acid will undergo dissociation.

(b) The benzoic acid will undergo association.

(d) Observed molar mass of benzoic acid in benzene is more than normal molar mass.

Clear selection

Relative lowering of vapour pressure is a colligative property because ________ .

1 point

(а) It depends on the concentration of a non- electrolyte solute in solution and does not depend on the nature of the solute molecules.

(b) It depends on number of particles of electrolyte solute in solution and does not depend on the nature of the solute particles.

(c) It depends on the concentration of a non- electrolyte solute in solution as well as on the nature of the solute molecules.

(d) It depends on the concentration of an electrolyte or nonelectrolyte solute in solution as well as on the nature of solute molecules.

Clear selection

Mole fraction of solute in a 1.0 molal aqueous solution is:

1 point

(a) 0.1770

(b) 0.0177

(d) 1.7700

Clear selection

In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

1 point

(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.

(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

(d) Assertion and reason both are incorrect statements.

(e) Assertion is wrong statement but reason is correct statement.

Assertion: When methyl alcohol is added to water, boiling point of water increases. Reason: When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

Option 7

Clear selection

Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is

1 point

(a) 0.46

(b) 0.40

(d) 0.36

Clear selection

Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are

1 point

(a) M, m

(b) F, x

(d) M, x

Clear selection

Which of the following condition is not satisfied by an ideal solution?

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(a) ΔHmixing = 0

(b) ΔVmixing = 0

(d) Formation of an azeotropic mixture

Clear selection

The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows

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(a) no deviation from Raoult’s Law.

(b) positive deviation from Raoult’s Law.

(d) that the solution is unsaturated.

Clear selection

The value of Henry’s constant KH is

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(а) greater for gases with higher solubility.

(b) greater for gases with lower solubility.

(d) not related to the solubility of gases

Clear selection

Consider the figure and mark the correct option.

1 point

(a) water will move from side (A) to side (B) if a pressure lower than osmotic pressure is applied on piston (B).

(b)water will move from side (B) to side (A) if a pressure greater than osmotic, pressure is applied on piston(B).

(d) water will move from side (A) to side (B) if pressure equal to osmotic pressure is applied on piston (A).

Clear selection

We have three aqueous solutions of NaCl labelled as ‘A’, ‘B’ and ‘C’ with concentrations 0.1M, 0.01M and 0.001M, respectively. The value of van’t Hoff factor for these solutions will be in the order __________ .

1 point

(a) iA < iB < iC

(b) iA > iB > iC

(d) iA < iB > iC

Clear selection

A solution containing 10 g per dm3 of urea (molar mass 60 g mol-1) is isotonic with 5% solution of non-volatile solute, MB of solute is

1 point

(a) 300 g mol-1

(b) 350 g mol-1

(d) 250 g mol-1

Clear selection

The temperature at which 10% aqueous solution of (W/V) of glucose will show the osmotic pressure of 16.4 atom is (R = 0.082 L atom K-1 mol-1)

1 point

(a) 360°C

(b) 180 K

(d) 360 K

Clear selection

Cone. H2SO4 is 98 % H2SO4 by mass has d = 1.84 g cm-3. Volume of acid required to make one litre of 0.1 M H2SO4 is

1 point

(a) 5.55 mL

(b) 10 mL

(d) 30 mL

Clear selection

What is mole fraction of solute in 1.00 m aqueous solution?

1 point

(a) 0.0354

(b) 0.0177

(d) 1.770

Clear selection

When 1 mole of benzene is mixed with 1 mole of toluene (vapour pressure of benzene – 12.8 kPa, Toluene = 3.85 kPa)

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(a) The vapour will contain equal amount of benzene and toluene.

(b) Not enough information is given for prediction.

(d) The vapour will contain higher percentage of toluene.

Clear selection

At 100°C, the vapour pressure of a solution of 6.5 g of solute in 100 g of water is 732 mm. If Kb is 0.52 K/m, the boiling point of solution will be [HOTS]

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(a) 102°C

(b) 103°C

(d) 100°C

Clear selection

Which of the following is incorrect for an ideal solution?

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(a) ∆Hmix =0

(b) ∆Vmix = 0

(d) ∆Gmix = 0

Clear selection

If molality of dilute solution is doubled, the value of molal depression constant (Kf) will be

1 point

(a) halved

(b) tripled

(d) doubled

Clear selection

Disclaimer: The set of questions aimed for the preparation of students appearing in 10+2 board exams. Questions have been compiled using open access online sources.

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