Class 10 Science Chapter 1 MCQ with Answers. We covered all the Class 10 Science Chapter 1 MCQ with Answers in this post for free so that you can practice well for the exam.
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MCQ on Class 10 Science for NEET Students
At 25 °C, acetone has a vapor pressure of 160 mm Hg and an organic liquid (B) has a vapor pressure of 18 mm Hg. Assuming that the mixture of acetone and (B) obeys Raoult’s law, what would be the vapor pressure of the solution having acetone and water with 50 mol % of each at 25 °C?
(A) 71 mm Hg
(B) 89 mm Hg
(C) 178 mm Hg
(D) 196 mm Hg
Option b – 89 mm Hg
Which of the following is the best description of a semipermeable membrane in the context of osmosis?
(A) A membrane, allows neither solute nor solvent particles to pass through it.
(B) A membrane, allows both solute and solvent particles to pass through it.
(C) A membrane allows solvent particles, but not solute particles, to pass through it.
(D) A membrane allows solute particles, but not solvent particles, to pass through it.
Option c – A membrane allows solvent particles, but not solute particles, to pass through it.
The vapor pressure of pure water at 23 °C is 19.8 mm Hg. If 0.1-mole glucose is dissolved in 178.2 g of water, what is the vapor pressure (in mm Hg) of the resultant solution at 23 °C?
(A) 18.8
(B) 19.6
(C) 20.0
(D) 39.6
Option b – 19.6
In which case, van’t Hoff factor maximum?
(A) LiCl, 50% ionized
(B) Na₂SO4, 40% ionized
(C) AICl3, 30% ionized
(D) Al2(SO4)3, 20% ionized
Option c – AICl3, 30% ionized
Consider the following solutions I: 1 M aq, glucose II 1 M aq. sodium chloride III: 1 M benzoic acid in benzene IV I M aq. ammonium phosphate Select the INCORRECT statement, considering that the association and dissociation of solutes are 100% in their respective solutions.
(A) I and III are isotonic solutions.
(B) III is hypotonic with respect to II.
(C) I, II, and IV are hypertonic with respect to III.
(D) IV is hypertonic with respect to I.
Option a – I and III are isotonic solutions.
An aqueous solution of an unknown solute (non-electrolyte) is taken in a graduated conical flask. The conical flask is stoppered using a cork. The content of the flask is then slowly heated and the change in volume is noted. It was observed that when the volume of the solution increases with the increase in temperature, the ………… decreases.
(A) molarity of the solution
(B) the molality of the solution
(C) mole fraction of the solute in the solution
(D) percentage by mass of solute in the solution
Option a – molarity of the solution
A non-ideal solution was prepared by mixing 20 mL chloroform and 50 mL acetone. The volume of the resulting mixture will be
(A) > 70 mL
(B) <70 mL
(C) = 70 mL
(D) ≥ 70 mL
Option b –
An aqueous solution of sucrose is prepared. When the concentration of the solution is increased, ………..
(A) the boiling point increases while vapor pressure decreases
(B) boiling point decreases while vapor pressure increases
(C) freezing point decreases while vapor pressure increases
(D) freezing point increases while vapor pressure decreases
Option a – the boiling point increases while vapor pressure decreases
Consider two binary solutions (P) and (Q) : (P) In bromoethane and chloroethane mixture, intermolecular interactions of A-A and B-B type are nearly the same as A-B type interactions. (Q) In ethanol and acetone mixture, A-A or B-B type intermolecular interactions are stronger than A-B type interactions. Which of the following is CORRECT?
(A) Solution (P) will follow Raoult’s law.
(B) Solution (Q) will follow Raoult’s law.
(C) Both the solutions will follow Raoult’s
(D) Neither of the solutions will follow Raoult’s law.
Option a – Solution (P) will follow Raoult’s law.
Three closed beakers are numbered 1, 2, and 3. Beaker 1 contains 100 cm³ of pure solvent water. Beaker 2 contains 100 cm³ of an aqueous solution of urea in which the mole fraction of water is 0.85 and beaker 3 contains 100 cm³ of an aqueous solution of urea in which the mole fraction of water is 0.95. All three beakers are maintained at a constant temperature. Identify the CORRECT option.
(A) The Vapour pressure of the solvent in beaker 1 is less than the vapor pressure of the solution in beaker 2.
(B) The Vapour pressure of the solvent in beaker 1 is less than the vapor pressure of the solution in beaker 3.
(C) Relative lowering of vapor pressure is higher in solution in beaker 2 as compared to beaker 3.
(D) Relative lowering of vapor pressure is higher in solution in beaker 3 compared to beaker 2.
Option c – Relative lowering of vapor pressure is higher in solution in beaker 2 as compared to beaker 3.
The vapor pressure of an aqueous dilute solution of glucose is 740 mm Hg at 373 K. The mole fraction of glucose and water in the solution is……… respectively.
(A) 0.013; 0.974
(B) 0.026; 0.974
(C) 0.760; 0.013
(D) 0.987; 0.026
Option b – 0.026; 0.974
The boiling point and freezing point of 1 m aqueous solution of NaCl will be ……… respectively.
(A) 298 K, 300 K
(B) 373 K, 273 K
(C) below 273 K, above 373 K
(D) above 373 K, below 273 K
Option d – above 373 K, below 273 K
Lowering of vapor pressure due to a nonvolatile, non-electrolyte in 1 molal aqueous solution at 100 °C is ………
(A) 13.38 mm Hg
(B) 14.12 mm Hg
(C) 31.21 mm Hg
(D) 35.21 mm Hg
Option a – 13.38 mm Hg
2.5 L of NaCl solution contains 5 moles of the solute. What is the molarity?
(A) 0.5 M
(B) 1.0 M
(C) 2.0 M
(D) 2.5 M
Option c – 2.0 M
Which of the following is INCORRECT?
(A) When a plant cell is placed in a hypertonic solution, the fluid (water) from the cell comes out and the cell shrinks.
(B) A raw mango placed in a concentrated salt solution loses water and shrivels into a pickle.
(C) When blood cells are placed in water containing less than 0.9% (mass/volume) sodium chloride, blood cells shrink due to the loss of water.
(D) When wilted flowers are placed in freshwater, they revive once again.
Option c – When blood cells are placed in water containing less than 0.9% (mass/volume) sodium chloride, blood cells shrink due to the loss of water.
18 g glucose is dissolved in a 1-liter aqueous solution at 27°C. The osmotic pressure of the solution will be …….. ( Class 10 Science Chapter 1 MCQ with Answers )
(A) 2.463 atm
(B) 4.926 atm
(C) 6.921 atm
(D) 9.421 atm
Option a – 2.463 atm
At a particular temperature, the vapor pressure of pure water is 39 kPa. Which one of the following is the most likely vapor pressure for a 0.5 M aqueous solution of sucrose at the same temperature?
(A) 0 kPa
(B) 41 kPa
(C) 39 kPa
(D) 37 kPa
Option d – 37 kPa
The osmotic pressure of a solution at 0°C is 4 atm. What will be its osmotic pressure at 546 K under similar conditions?
(A) 2 atm
(B) 4 atm
(C) 8 atm
(D) 10 atm
Option c – 8 atm
An ideal solution was prepared by mixing 3 moles of methyl alcohol with 2 moles of ethyl alcohol at a particular temperature. The vapor pressure of pure methyl alcohol and pure ethyl alcohol at this temperature is 88.7 mm Hg and 44.5 mm Hg respectively. The partial vapor pressure of methyl alcohol is ………..
(A) 53.22 mm Hg
(B) 26.70 mm Hg
(C) 266.10 mm Hg
(D) 147.83 mm Hg
Option a – 53.22 mm Hg
The osmotic pressure of 0.1 M aqueous solution of MgCl₂ at 300 K is 4.92 atm. What will be the percentage ionization of the salt?
(A) 49.5%
(B) 59.2%
(C) 69.8%
(D) 72.3%
Option a – 49.5%
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