Solutions, Suspensions and ColloidsPractice Questions & MCQs
Practice Solutions, Suspensions and Colloids questions from Is Matter Around Us Pure (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Solutions, Suspensions and ColloidsQuiz - Solve & Score
Q1. While pickling vegetables a cook stirs 15 g of common salt into 135 g of warm water. What percentage by mass of the solution is the dissolved substance?
- A.90%
- B.15%
- C.10%
- D.11.1111%
Answer: C. 10%
Mass of solution = 15 + 135 = 150 g. Mass % of solute = (solute/solution) x 100 = (15/150) x 100 = 10%.
Q2. A gardener blends 40 g of urea into 160 g of water for a leaf spray. By mass, what percent of the final solution is made up of the solute?
- A.20%
- B.40%
- C.25%
- D.80%
Answer: A. 20%
Mass of solution = 40 + 160 = 200 g. Mass % of solute = (solute/solution) x 100 = (40/200) x 100 = 20%.
Q3. A nurse dissolves 9 g of boric acid in 141 g of water to make a wash. What is the mass percentage of solute (mass by mass) in the solution?
- A.6%
- B.94%
- C.6.383%
- D.9%
Answer: A. 6%
Mass of solution = 9 + 141 = 150 g. Mass % of solute = (solute/solution) x 100 = (9/150) x 100 = 6%.
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