Case Study and Passage Based Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure?

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Case Study Questions:

Question 1:

Akshita wants to separate the mixture of dyes constituting a sample of ink. She marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in figure. The filter paper was removed when the water moved near the top of the filter paper.

(i) Identify the technique used by the Akshita.
(a) Sedimentation
(b) Filtration
(c) Chromatography
(d) Distillation

Answer Answer: (c) Chromatography.

(ii) What would you expect to see, if the ink contains three different coloured components?
(a) We will not see any band on the filter paper.
(b) We would see three bands on the filter paper at various lengths.
(c) We would see infinite bands on the filter paper.
(d) We would see single band on the filter paper.

Answer Answer: (b) The components of the ink will travel with water and we would see three bands on the filter paper at various lengths.

(iii) An application where you can use this technique is:
(a) To separate salt from sand
(b) To separate wheat from husk
(c) To separate oil from water
(d) To separate drugs from blood.

Answer Answer: (d) To separate drugs from blood.

(iv) The above process is used for the separation of :
(a) insoluble substances
(b) single solute that dissolves in soluble solvent.
(c) solutes that dissolve in the same solvent.
(d) solutes that dissolve in the different solvents.

Answer Answer: (c) For the separation of those solutes that dissolve in the same solvent.

(v) What is chromatography ?
(a) It is an agricultural method to separate grains
(b) A method to separate magnetic impurities from non-magnetic impurities
(c) The process of separating the suspended particles of an insoluble substance
(d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

Answer Answer: (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

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