Separation of Liquid Mixtures, Class 9 Science

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. In the given experiment, a mixture of methanol and ethanol is taken in a distillation flask. Which of the liquid component is obtained first after fractional distillation process?

  Methanol

 Ethanol

 Both Methanol and ethanol

 Water

Question 1 of 10

2. The components of crude petroleum gets separated at different heights depending upon their _______ in a fractional distillation column.

 melting points

 density

 boiling points

 colour

Question 2 of 10

3. Why do we separate ethyl alcohol and water by fractional distillation?

 The difference in the boiling point of the liquids is less than 30°C.

 Because water is a universal solvent.

 Because both of them are liquids.

 All of the above

Question 3 of 10

4. In fractional distillation, what is the purpose of the beads packed in column?

  More liquid is distilled when beads are used in the column.

  To restrict the path of moving vapours.

 Beads provide surface for vapours to cool and condense repeatedly.

 Beads provide larger surface for heating.

Question 4 of 10

5. The separation of two immiscible liquids by a separating funnel depends upon:

 The difference in their densities.

 The difference in their colours.

 The difference in their melting points.

 The difference in their boiling points.

Question 5 of 10

6. Which of the following method is used to separate mixture of two miscible liquids?

 Sublimation

 Simple or fractional distillation

 Separation using a separating funnel

 Sedimentation and decantation method

Question 6 of 10

7. Which of the following method is used to separate a mixture of cooking oil and water?

 Separation using a separating funnel

 Fractional distillation

 Centrifugation

 Filtration

Question 7 of 10

8. Which of the following apparatus is used in the assembly for fractional distillation process?

 Tongs

 Evaporating dish

 Test tube

  Fractionating column

Question 8 of 10

9. What is the basic principle behind fractional distillation?

 The liquids should decompose during the process of fractional distillation.

 The difference in boiling points of two or more miscible liquids is less than 30°C.

 Difference in the molecular weight of two or more miscible liquids should be 50g/mol.

 Difference in the boiling points of the miscible liquids should be 30°C or more.

Question 9 of 10

10. Which of the following apparatus is not used in the assembly for simple distillation process?

 Distillation flask

 Water condenser

 Fractional column

  Thermometer

Question 10 of 10

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