MCQs 1 on Is MATTER AROUND US PURE ? => 9th Class

solve online MCQs 1 on Is MATTER AROUND US PURE ? => 9th Class for competitve examinations like CBSE Neet, CBSE Board, CSIR NET, GRE etc.

1. When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:

• Decrease in solubility on decreasing temperature
• Decrease in solubility on increasing temperature
• Decrease in solubility on decreasing pressure
• Decrease in solubility on increasing pressure

2. A mixture of oil and water can be separated by:

• Sublimation
• Crystallisation
• Chromatography
• Separating funnel

Questions 3 to 5 are based on the following information: Four samples A, B, C, D are prepared by adding a pinch of copper sulphate, a spatula of copper sulphate, a spatula of chalk powder, and some milk, to water respectively. 3. Which one is the colloidal solution among them?

• C
• D
• B
• A

4. Which of these will form a clear and transparent solution:

• A
• B
• A and B
• B and D

5. Which of these will exhibit the Tyndall effect?

• A and D
• B and C
• A and B
• C

6. Which of the following represents a chemical change?

• Extraction of copper from copper pyrites
• Distillation of water
• Melting of wax
• Dissolution of salt in water

7. The sequence of steps for separating a mixture of salt, sand and camphor is:

• Adding water, filtration, evaporation, sublimation
• Adding water, filtration, sublimation, evaporation
• Sublimation, adding water, filtration, evaporation
• Sublimation, adding water, evaporation, filtration

8. Which of the following is the correct set of apparatus for fractional distillation?

• Round bottomed flask, thermometer, water condenser and beaker
• Round bottomed flask, thermometer, air condenser and beaker
• Round bottomed flask, thermometer, fractionating column, water condenser and flask
• Round bottomed flask, thermometer, fractionating column, air condenser and flask

9. In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?

• A
• B
• Both at the same speed
• Separation of dyes is independent of the solubility in solvent

10.Different components can be separated from petroleum by:

• FiltrationA
• Chromatography
• Simple distillation
• Fractional distillation

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