Exploring Mixtures and their Separation
CBSE · Class 9 · Science
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A student mixes 287 g of compound B with 100 g of water at 60°C. If the solution is cooled to 40°C, how much compound B will crystallize out?
A hot saturated solution contains 287 g of compound B dissolved in 100 g water at 60°C. After cooling to 40°C, what mass percentage of compound B remains dissolved in the solution, if the water mass stays 100 g?
A copper sulfate crystallization experiment starts with 25 mL water and 1 g copper sulfate, and more copper sulfate is added until saturation. If 7 g is added in total and the solution is then cooled, how much copper sulfate remains dissolved before any crystals form, assuming all 7 g dissolved?
A student prepares a mixture of 5 mL mustard oil and 20 mL water in a separating funnel. What is the ratio of mustard oil to water by volume?
Sample Questions
A saline drip contains 0.9% m/v sodium chloride. How many grams of sodium chloride are present in 750 mL of the solution?
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6.75 g
0.9% m/v means 0.9 g in 100 mL. For 750 mL, mass = (0.9/100) × 750 = 6.75 g.
A liquid pesticide spray is prepared by mixing 1 mL pesticide with water to make 100 mL solution. If 3 such sprays are made, what is the total volume of pesticide used?
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3 mL
Each 100 mL spray contains 1 mL pesticide. For 3 sprays, total pesticide used = 1 + 1 + 1 = 3 mL.
A sample of talcum powder contains 4% m/m zinc oxide. How much zinc oxide is present in 300 g of the powder?
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12 g
4% m/m means 4 g solute in 100 g solution. For 300 g powder, zinc oxide = (4/100) × 300 = 12 g.
A mixture of acetone and water is separated by distillation. If acetone boils at about 56°C and water boils at 100°C, what is the boiling point difference?
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44°C
Boiling point difference = 100°C - 56°C = 44°C. This is large enough for distillation.
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- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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