Mixtures vs Pure SubstancesPractice Questions & MCQs
Practice Mixtures vs Pure Substances 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.
Mixtures vs Pure SubstancesQuiz - Solve & Score
Q1. A nurse prepares a saline drip by dissolving 5 g of salt in 95 g of water. What is the mass percentage of salt in the resulting salt solution?
- A.5
- B.5.26%
- C.5%
- D.95%
Answer: C. 5%
Total mass of solution = solute + solvent = 5 + 95 = 100 g. Mass percent of salt = (mass of salt / total mass) x 100 = (5/100) x 100 = 5%.
Q2. A baker stirs 8 g of sugar into 92 g of warm milk to make a sweet drink. What is the mass percentage of sugar in the resulting sweetened milk?
- A.8%
- B.8
- C.8.70%
- D.92%
Answer: A. 8%
Total mass of solution = solute + solvent = 8 + 92 = 100 g. Mass percent of sugar = (mass of sugar / total mass) x 100 = (8/100) x 100 = 8%.
Q3. A gardener mixes 12 g of urea fertiliser into 88 g of irrigation water. What is the mass percentage of urea in the resulting fertiliser solution?
- A.13.64%
- B.12%
- C.88%
- D.12
Answer: B. 12%
Total mass of solution = solute + solvent = 12 + 88 = 100 g. Mass percent of urea = (mass of urea / total mass) x 100 = (12/100) x 100 = 12%.
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