Chemistry Class 12 Objective Question
Chemistry objective question 2024
1. Which is not affected by temperature ?
a. Normality
b. Molality
c. Molarity
d. Formality
Ans – ( B )
2. Which one of the following is a colligative property ?
a. Viscosity
b. Surface tension
c. Refractive index
d. Osmotic pressure
Ans – ( D )
3. The Electromotive fore ( EMF ) of the ell for the cell reaction at equilibrium state is
a. positive
b. zero
c. negative
d. non of these
Ans – ( C )
4. Which of the following is a colligative property of solution ?
a. Osmosis
b. Surface tension
c. Conductivity
d. Half-life period
Ans – ( A )
5. Which of the following is the property of ideal solution ?
a. Obeys Raoult’s law
b. Does not obey Raoult’s law
c. Both ( A ) and ( B )
d. None of these
Ans – ( A )
6. The boiling point of water decreases at high mountains because
a. Temperature is low
b. Atmospheric pressure is low
c. Pressure is high
d. More air
Ans – ( B )
Chemistry Objectives Question 2024
7. By osmosis semipermeable membrane ( S.P.M. ) allows to pass
a. Solute molecules
b. Solvent molecules
c. Complex ion
d. Simple ion
Ans – ( B )
8. Which of the following is not a colligative property of solu-tion ?
a. Depression of freezing point
b. Elevation of Boiling point
c. Relative lowering vapour pressure
d. Optical activity
Ans – ( D )
9. Osmotic pressure can be increased by
a. Increasing temperature
b. Decreasing temperature
c. Increasing volume
d. None
Ans – ( A )
10. Atomic mass is equal to
a. Number of electrons of an atom
b. Sum of the no. of electrons and protons of an atom
c. Sum of the no. of neutrons and protons of an atom
d. none of these
Ans – ( B )
11. Which among the following is a colligative property ?
a. Boiling point
b. Vapour pressure
c. Osmotic pressure
d. Freezing point
Ans – ( C )
12. An example of an electrolyte is
a. Sugar
b. Sodium acetate
c. Urea
d. Benzene
Ans – ( B )
13. Which concentration unit is independent of temperature ?
a. Molarity
b. Mass Volume percentage
c. Molately
d. Normality
Ans – ( C )
14. At constant temperature the isotonic solution have same
a. Molality
b. Molar concentration
c. Normality
d. None of these
Ans – ( B )
15. Molal depression constant depends on-
a. Nature of the solute
b. Nature of the solvent
c. Heat of the solution
d. Vapour pressure of the solution
Ans – ( B )
Most Vvi Chemistry Objective Question
16. Which of the following units is useful in relating concentration of solution with its vapour pressure ?
a. Mole fraction
b. Parts per million
c. Mass percentage
d. Molality
Ans – ( A )
17. For the determination of the molar mass of colloids, which colligative property of polymers and proteins is used ?
a. Effusion pressure
b. Atmospheric pressure
c. Osmitic pressure
d. Turgor pressure
Ans – ( C )
18. In which of the following 0.1 M aqueous solution will have lowest freezing point ?
a. Potassium sulphate
b. Sodium Chloride
c. Urea
d. Glucose
Ans – ( A )
19. The Van’t Hoff factor for a solute, that associates in solution is
a. Zero
b. More than 1
c. Less than 1
d. 1.0
Ans – ( C )
20. Backmann’s thermometer is appropriate for the calculation of
a. Boiling point
b. Difference in temperature
c. Freezing point
d. Absolute temp.
Ans – ( B )
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