MCQ Questions

Question No. 1

Fill in the blanks

Answer :

(b) Compounds have............... melting points.

(c) Sugarcane juice is a mixture of..............., water and many other substances.

(d) Separation of components is done to obtain a............... substance.

(e) Boiling point of pure water is............ than that of impure water.

(a) Components retain their properties in a .................

Question No. 2

State True or False

Answer :

(a) A pure substance has a fixed melting and boiling point.

(b) Elements are pure substances.

(d) The process by which two miscible liquids are separated by filtration.

(e) Chromatography is used to separate pigments from natural colours.

(c) Separation of components of a mixture is a useful process.

Question No. 3

Match Columns:

Answer :

None

Question No. 4

Very short answer type questions

Answer :

(1) What is a symbol?

(3) What is centrifugation method?

(5) Name the method used to separate husk from wheat.

(2) What is a compound?

(4) What is a mixture?

Question No. 5

Short answer type questions

Answer :

(b) Write the symbols of the following elements: (i) Boron (ii) Silicon (iii) Neon.

(c) Write the chemical formulae of the following: (i) Sodium hydrogen carbonate (ii) Magnesium sulphate

(a) Write the common names of the following: (i) Calcium oxide (ii) Sodium carbonate (iii) Sodium bicarbonate

(d) Write the two differences between element and compound.

(e) Describe the method to obtain pure salt from rock salt.

Question No. 6

Long answer type questions

Answer :

(1) Write any four characteristics of compounds.

(2) Name the property of the component used for separating the following: (i) Salt and camphor (ii) Wheat and husk (iii) Iron filings and sulphur

(3) Explain the fractional distillation with an example.

(4) What is chromatography? Write two advantages of chromatography.

Question No. 7

Filtration is a method to separate the components of a-

Answer :

solution

both (a) and (b)

pure substance

mixture of a liquid and an insoluble substance-

Question No. 8

In chromatography, the filter paper is-

Answer :

Stationary phase

mobile phase

mixture

none of the above

Question No. 9

Which method is used to separate pebbles and stones from sand?

Answer :

Hand-picking

Winnowing

Sieving

Any of these

Question No. 10

The components of a solution (say sugar in water) can be separated by-

Answer :

filtration

Evaporation

sedimentation

decantation

Question No. 11

Sand from water is separated by-

Answer :

sieving

evaporation

filtration

sedimentation and decantation

Chapter

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