Class 12 Chemistry Solutions MCQs With Answer

Class 12 chemistry MCQs with answers are provided here for Solutions. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 12 chemistry syllabus. By practicing these Class 12 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Annual examinations as well as other entrance exams such as NEET and JEE.

Class 12 Chemistry Solutions MCQs With Answer

Q3. At a given temperature, osmotic pressure of a concentrated solution of a substance _.

1. Is higher than that at a dilute solution.
2. Is lower than that of a dilute solution.
3. Is same as that of a dilute solution.
4. Cannot be compared with osmotic pressure of dilute solution.

Q4. At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is __.

1. Less than the rate of crystallisation.
2. Greater than the rate of crystallisation.
3. Equal to the rate of crystallisation.
4. Zero.

Q8. 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. Methanol and acetone.
2. Chloroform and acetone.
3. Nitric acid and water.
4. Phenol and aniline.

Q9. If two liquids A and B form minimum boiling azeotrope at some specific composition then __.

1. A–B interactions are stronger than those between A–A or B–B.
2. vapour pressure of solution increases because more number of molecules of liquids A and B can escapefrom the solution.
3. vapour pressure of solution decreases because less number of molecules of only one of the liquids escape
   from the solution.
4. A–B interactions are weaker than those between A–A or B–B.

Q10. Relative lowering of vapour pressure is a colligative property because__________.

1. It depends on the concentration of a non electrolyte solute in solution and does not depend on the nature
   of the solute molecules.
2. It depends on number of particles of electrolyte solute in solution and does not depend on the nature of
   the solute particles.
3. It depends on the concentration of a non electrolyte solute in solution as well as on the nature of the solute
   molecules.
4. It depends on the concentration of an electrolyte or non electrolyte solute in solution as well as on the
   nature of solute molecules.

Q11. On the basis of information given below mark the correct option.
Information:

1. In bromoethane and chloroethane mixture intermolecular interactions of A–A and B–B type are nearly same
   as A–B type interactions.
2. In ethanol and acetone mixture A–A or B–B type intermolecular interactions are stronger than A–B type
   interactions.
3. In chloroform and acetone mixture A–A or B–B type intermolecular interactions are weaker than A–B type
   interactions.

1. Solution (B) and (C) will follow Raoult’s law.
2. Solution (A) will follow Raoult’s law.
3. Solution (B) will show negative deviation from Raoult’s law.
4. Solution (C) will show positive deviation from Raoult’s law.

Q12. Which of the following binary mixtures will have same composition in liquid and vapour phase?

1. Benzene-Toluene.
2. Water-Nitric acid.
3. Water-Ethanol.
4. n-Hexane -n-Heptane.

Q13. Which of the following factor (s) affect the solubility of a gaseous solute in the fixed volume of liquid solvent?
(a) Nature of solute (b) Temperature (c) Pressure

1. (a) and (c) at constant T.
2. (a) and (b) at constant P.
3. (b) and (c) only.
4. (c) only.

Q14. In comparison to a 0.01M solution of glucose, the depression in freezing point of a 0.01M MgCl solution is
__.

1. The same.
2. About twice.
3. About three times.
4. About six times.

Q15. A beaker contains a solution of substance ‘A’. Precipitation of substance ‘A’ takes place when small amount of ‘A’ is
added to the solution. The solution is _.

1. Saturated.
2. Supersaturated.
3. Unsaturated.
4. Concentrated.

Q16. Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not
depend upon _.

1. Temperature.
2. Nature of solute.
3. Pressure.
4. Nature of solvent.

.

Q17. Low concentration of oxygen in the blood and tissues of people living at high altitude is due to __.

1. Low temperature.
2. Low atmospheric pressure.
3. High atmospheric pressure.
4. Both low temperature and high atmospheric pressure.

Q18. Colligative properties depend on __.

1. The nature of the solute particles dissolved in solution.
2. The number of solute particles in solution.
3. The physical properties of the solute particles dissolved in solution.
4. The nature of solvent particles.

Q19. 4L of 0.02M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant
solution is __.

1. 0.004
2. 0.008
3. 0.012
4. 0.016

Q20. An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because _.

1. It gains water due to osmosis.
2. It loses water due to reverse osmosis.
3. It gains water due to reverse osmosis.
4. It loses water due to osmosis.