CBSE Class 12 Chemistry Solutions Question Bank Set B

Read and download free pdf of CBSE Class 12 Chemistry Solutions Question Bank Set B. Download printable Chemistry Class 12 Worksheets in pdf format, CBSE Class 12 Chemistry Solutions Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Chemistry Class 12 Assignments and practice them daily to get better marks in tests and exams for Class 12. Free chapter wise worksheets with answers have been designed by Class 12 teachers as per latest examination pattern

Solutions Chemistry Worksheet for Class 12

Class 12 Chemistry students should refer to the following printable worksheet in Pdf in Class 12. This test paper with questions and solutions for Class 12 Chemistry will be very useful for tests and exams and help you to score better marks

Class 12 Chemistry Solutions Worksheet Pdf

SOLUTIONS
OBJECTIVE TYPE QUESTIONS
 
Multiple choice type questions
 
1. Which is true about enthalpy of solution containing benzene and toluene?
(a) ΔHsol < 0
(b) ΔHsol = 0
(c) ΔHsol > 0
(d) ΔHsol may be zero or greater than zero
 
2. Which of the following is correct for a solution showing positive deviations from Raoult’s law?
(a) ΔV = +ve, ΔH = +ve
(b) ΔV = –ve, ΔH = +ve
(c) ΔV = +ve, ΔH = –ve
(d) ΔV = –ve, ΔH = –ve
 
3. A 5% solution of sugarcane (Mol wt = 342) is isotonic with 1% solution of X under similar conditions. The molar mass of X is:
(a) 136.2       (b) 68.4
(c) 34.2         (d) 171.2
 
4. During depression in freezing point in a solution, the following are in equilibrium
(a) liquid solvent, solid solvent
(b) liquid solvent, solid solute
(c) liquid solute, solid solute
(d) liquid solute, solid solvent
 
5. The number of moles of sodium hydroxide present in 2.5 L and 0.5 M aqueous solution will be
(a) 1.25 (b) 0.5
(c) 12.5 (d) 5
 
6. The azeotropic mixture of water and ethonal boils at 78.15°C. When this mixture is distilled, it is possible to obtain
(a) pure H2O
(b) pure C2H5OH
(c) pure H2O as well as pure C2H5OH
(d) neither H2O nor C2H5OH in their pure state
 
7. The solubility of a gas in a liquid increases with
(a) increase of temperature
(b) amount of liquid taken
(c) decrease in temperature
(d) reduction of gas pressure
 
8. During osmosis, flow of water through a semipermeable membrane is
(a) from both sides of semi-permeable membrane with unequal flow rates
(b) from solution having lower concentration only
(c) from solution having higher concentration only
(d) from both sides of semi-permeable membrane with equal flow rates
 
9. According to Raoult’s law, relative lowering of vapour pressure for a solution is equal to
(a) mole fraction of the solute
(b) mole fraction of a solvent
(c) moles of a solute
(d) moles of a solvent
 
10. A solution of acetone in ethanol
(a) behaves like a near ideal solution
(b) obeys Raoult’s law
(c) shows a negative deviation from Raoult’s law
(d) shows a positive deviation from Raoult’s law
 
11. V litres of a solution contains m2 g of non-volatile solute of molecular mass M2. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure?
CBSE Class 12 Chemistry Solutions Question Bank Set B 1
 
12. The rise in the boiling point of a solution containing 1.8 g of glucose in 100 g of solvent is 0.1°C.The molal elevation constant of the liquid is
(a) 1 K/m          (b) 0.1 K/m
(c) 0.01 K/m     (d) 10 K/m
 
13. The mass of glucose that should be dissolved in 50 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
(a) 1 g              (b) 3 g
(c) 6 g              (d) 18 g
 
14. 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 mol of Q would be
(a) 20 torr        (b) 72 torr
(c) 68 torr        (d) 140 torr
 
15. 1.00 g of a non-electrolyte solute (molar mass 250 g mol–1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, Kf of benzene is 5.12 K kg mol–1, the freezing point of benzene will be lowered by
(a) 0.5 K         (b) 0.2 K
(c) 0.4 K         (d) 0.3 K
 
16. Which of the following can form minimum boiling point azeotropic mixture?
(a) Methyl alcohol + water
(b) Carbon tetrachloride + chloroform
(c) Ethyl alcohol + water
(d) Acetone + chloroform
 
17. The amount of solute (molar mass 60 g/mol) that must be added to 180 g of water so that the vapour pressure of water is lowered by 10% is
(a) 30 g         (b) 60 g
(c) 120 g       (d) 12 g
 
18. An ideal solution is formed when its components
(a) have no volume change on mixing
(b) have no enthalpy change on mixing
(c) Both (a) and (b) are correct
(d) Neither (a) nor (b) is correct
 
19. A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm Hg at 300 K. The vapour pressure of propyl alcohol is 200 mm Hg. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm Hg) at the same temperature will be
(a) 360    (b) 350
(c) 300    (d) 700
 
20. At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is ______.
(a) less than the rate of crystallisation.
(b) greater than the rate of crystallisation.
(c) equal to the rate of crystallisation.
(d) zero
 
21. The value of Henry's constant KH is _______.
(a) greater for gases with higher solubility.
(b) greater for gases with lower solubility.
(c) constant for all gases.
(d) not related to the solubility of gases.
 
22. Osmotic pressure of a solution at a given temperature
(a) increases with concentration
(b) decreases with concentration
(c) remains same
(d) initially increases and then decreases
 
23. Blood cells retain their normal shape in solution which are
(a) hypotonic to blood     (b) isotonic to blood
(c) hypertonic to blood    (d) equinormal to blood
 
24. When a gas is bubbled through water at 298 K, a very dilute solution of the gas is obtained. Henry’s law constant for the gas at 298 K is 100 kbar. If the gas exerts a partial pressure of 1 bar, the number of millimoles of the gas dissolved in one litre of water is
(a) 0.555      (b) 5.55
(c) 0.0555    (d) 55.5


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