CBSE Class 9 Science Exploring Mixtures and Their Separation (Class 9 NCERT New) Quiz 2

1. What is a solvent?

A A solvent is the substance that dissolves the solute in a solution. B A solvent is the substance that gets dissolved in a solution. C A solvent is the solid part of a solution. D A solvent is the gas released during a chemical reaction.

2. In the mixture of sugar and water, which is the solute and which is the solvent?

A Sugar is the solute and water is the solvent. B Water is the solute and sugar is the solvent. C Both sugar and water are solutes. D Both sugar and water are solvents.

3. The right proportion is always essential when preparing a solution because:

A it ensures the solution has the desired properties and effectiveness. B it makes the solution look colorful. C it allows the solution to be prepared faster. D it prevents the solution from evaporating quickly.

4. Who is Dilip Mahalanabis and what is his contribution to science?

A Dilip Mahalanabis is an Indian paediatrician who developed and implemented the treatment for dehydration caused by diseases such as diarrhoea and cholera. He formulated the ORS that has revolutionised rehydration therapy. B Dilip Mahalanabis is a renowned physicist known for his work in quantum mechanics. C Dilip Mahalanabis is a famous botanist who discovered several new plant species. D Dilip Mahalanabis is a chemist who invented a new method for synthesizing antibiotics.

5. If 10 g of salt is dissolved in 90 g of water, calculate the mass by mass percentage of the solution formed.

A 10 % m/m B 5 % m/m C 20 % m/m D 15 % m/m

6. If 5 g of glucose is dissolved in water to make 100 mL of solution, calculate its concentration in mass by volume percentage.

A 5 % m/v B 0.5 % m/v C 10 % m/v D 0.05 % m/v

7. A common talcum powder contains 4% w/m zinc oxide, which acts as an antiseptic. How much zinc oxide is present in 300 g of the talcum powder?

A 12 g B 4 g C 8 g D 16 g

8. What is the % v/v of orange juice concentrate in the mixture you prepared?

A 10% B 25% C 50% D 75%

9. To make vinegar from glacial acetic acid, you should:

A Dilute glacial acetic acid with water to about 4-8% concentration. B Heat glacial acetic acid to increase its acidity. C Mix glacial acetic acid with sugar to form vinegar. D Add salt to glacial acetic acid to create vinegar.

10. Based on the solubility curves for compounds ‘A’ and ‘B’ as solutes in water, predict which compound will dissolve more in a given amount of water at a given temperature.

A Compound ‘A’ will dissolve more than compound ‘B’. B Compound ‘B’ will dissolve more than compound ‘A’. C Both compounds will dissolve equally at all temperatures. D Neither compound will dissolve in water at any temperature.