Solutions and ConcentrationPractice Questions & MCQs

Q1. Which property is true of a true solution?

• A.it passes unchanged through filter paper
• B.it scatters a beam of light (Tyndall effect)
• C.its particles settle on standing
• D.its particles are visible to the naked eye

Answer: A. it passes unchanged through filter paper

Q2. Which factor most affects how much solid solute can dissolve in a given solvent?

• A.the temperature of the solvent
• B.the colour of the container
• C.the time of day
• D.the shape of the beaker

Answer: A. the temperature of the solvent

To see why, recall that Classify the listed substance as element / compound / homogeneous mixture / heterogeneous mixture by its composition; only one label fits => match the option list against that label; hence the answer = the temperature of the solvent. That fits the listed correct option directly - Correct. As for the rest: option B) 'the colour of the container' is wrong because Container colour does not affect solubility; option C) 'the time of day' misses the point - Time of day is irrelevant to solubility. Hence the answer is A) the temperature of the solvent.

Q3. Two solutions: A has 10 g solute in 90 g water, B has 20 g solute in 80 g water. Which is more concentrated?

• A.B, with 20% versus A's 10%
• B.A, because it has more water
• C.both are equal
• D.A, with 20% versus B's 10%

Answer: A. B, with 20% versus A's 10%

Given 10 g, 90 g, 20 g, 80 g, asked for the unknown. By acceleration due to gravity g = G*M/R^2 at the surface of a body of mass M and radius R. acceleration due to gravity g = G*M/R^2 at the surface of a body of mass M and radius R → hence the listed value = B, with 20% versus A's 10%. substituting the relevant constants. Putting it together option A) B, with 20% versus A's 10%. Others fail: option B) 'A, because it has more water' is incorrect: More water means more dilute; A is 10%, less concentrated than B; option C) 'both are equal' is incorrect: A is 10% and B is 20%; they are not equal.