Free Solutions and Colloids MCQs with Answers
119 Solutions and Colloids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Solutions are described using molarity, molality, normality, mole fraction, percentage concentration and parts per million. Coverage also includes vapour-pressure lowering, boiling-point elevation, freezing-point depression and osmotic pressure, then distinguishes true solutions, colloids and suspensions by particle size, stability, light scattering and settling.
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Read the Solutions and Colloids notesFree MDCAT chapter notes with key terms119 questions · page 3 of 6
- A. Pure HCl only
- B. Pure water only
- C. Neither HCl nor water
- D. Both water and HCl in pure state
Explanation: An azeotrope is a mixture that exhibits the same concentration in the vapor phase and the liquid phase.
Correct answer: Neither HCl nor water- A. Molality
- B. Molarity
- C. Mole fraction
- D. All of these
Explanation: In case of dilute solution M=m∝ mole fraction.
Correct answer: Mole fraction- A. Ca(OH)2
- B. Na2CO3
- C. Na2SO4
- D. All of these
Explanation: All get dissolved with evolution of heat.
Correct answer: All of these44. On mixing 10 mL of carbon tetrachloride with 10 mL of benzene the total volume of the solution is:
- A. > 20 mL
- B. < 20 mL
- C. = 20 mL
- D. Cannot be predicted
Explanation: No changes in interparticle forces as both are non-polar.
Correct answer: = 20 mL- A. 0.377
- B. 0.605
- C. 0.623
- D. 0.395
Explanation: By Raoult's law x_benzene = P/P° = 167/268 = 0.623, so x_solute = 0.377.
Correct answer: 0.605- A. NaCl
- B. Na2SO4
- C. Al2(SO4)3
- D. Al(NO3)3
Explanation: K3[Fe(CN)6]dissociates into 3K+ ions and one [Fe(CN)6]3- ion. So its Van't Hoff factor is 4.
Correct answer: Al(NO3)3- A. KCl
- B. MgCl2
- C. AlCl3
- D. Na3PO4
Explanation: Since As2S3 is a negatively charged colloidal sol, hence positively charged ion will cause its coagulation.
Correct answer: AlCl3- A. higher
- B. lower
- C. some times higher & some times lower
- D. none
Explanation: At the surface, a molecule is on one side surrounded by molecules of the same type and on the other side of another type.
Correct answer: higher- A. ∆H>0, ∆S<0
- B. ∆H<0, ∆S> 0
- C. ∆H<0 , ∆S< 0
- D. ∆ H>0,∆ S<0
Explanation: Both ∆H & ∆S are positive, while ∆G<0. which makes the adsorption process feasible.
Correct answer: ∆H>0, ∆S<0- A. elevation in boiling point
- B. depression in freezing point
- C. osmotic pressure
- D. relative lowering of vapour pressure
Explanation: For determining the molar mass of a polymer osmotic pressure is preferred because it is done at normal (room) temperature.
Correct answer: osmotic pressure- A. the Brownian motion become fast
- B. the Brownian motion becomes slow
- C. Brownian motion remains same
- D. none of these
Explanation: Brownian movement is due to the unequal bombardments of the moving molecules of dispersion medium on colloidal particles.
Correct answer: the Brownian motion becomes slow- A. As2S3 , Au in their colloidal sols are negatively charged
- B. Fe(OH)3 , Al(OH)3 are positively charged in their colloidal sols.
- C. Ag & Pt are positively charged in their colloidal sols.
- D. smoke is dispersion of positively charged colloidal particles of carbon in air
Explanation: Ag & Pt are negatively charged. They move towards anode in electrophoresis.
Correct answer: Ag & Pt are positively charged in their colloidal sols.53. The presence of soluble soap as a emulsifying agent generally forms the formation of emulsion of :
- A. oil in water
- B. water in oil
- C. both type
- D. none
Explanation: Emulsification takes place by reduction of interfacial tension between two phases.
Correct answer: oil in water- A. 50
- B. 5
- C. 47.6
- D. None of these
Explanation: Millimoles of NaCl added = 5 Volume of the sol containing NaCl solution = 100 mL.
Correct answer: 50- A. Catalyst
- B. Inhibitor
- C. Promotor
- D. Poison
Explanation: Poison, which come from the reacting substances or products of the reaction itself, accumulate on the surface of solid catalysts and cause…
Correct answer: Poison- A. The curve showing the effect of temperature on the extent of adsorption at a given pressure
- B. The curve showing the variation of pressure with temperature, for a given amount of adsorption.
- C. The curve showing the variation of adsorption with pressure at a constant temperature.
- D. A line parallel to x-axis.
Explanation: The adsorption isostere is relation of the equilibrium pressure to the temperature at a constant value of the amount, or excess amount, of…
Correct answer: The curve showing the variation of pressure with temperature, for a given amount of adsorption.- A. Cataphoresis
- B. Electrosmosis
- C. Sedimentation
- D. Electrodialysis
Explanation: If the experiment is set such that only the colloidal particles are allowed to move and not the dispersion media particles it is known as…
Correct answer: Cataphoresis- A. Will Decrease
- B. will Increase
- C. Remain same
- D. cannot say
Explanation: Physisorption is exothermic in nature. Therefore, After increasing temperature, the rate of physiosorption will derease.
Correct answer: Will Decrease- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Colloidal solution of Sulpher is formed.
Correct answer: Option B- A. Colloid becomes extremely stable
- B. Colloids get coagulated
- C. No effect is observed
- D. Colloids convert into true solution
Explanation: If all ions are removed the colloidal particles get neutrelized and associate with each other forming suspensions.
Correct answer: Colloids get coagulated