ICSE Class-8th Physical and Chemical Changes Essential Chemistry Ch-2 Bharti Bhawan Publishers


Exercise Objective Type Questions

(ICSE Class-8th Physical and Chemical Changes Essential Chemistry Ch-2 Bharti Bhawan)

Page 17

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Choose the correct option.

Question 1

Which of the following is not a reversible change?

(a) The change of water into water vapour

(b) The cooling of a hot iron

(c) The condensation of sulphur vapour

(d) The burning oft LPG

Answer :  

(d) The burning oft LPG

Question 2  ICSE Class-8th Essential Physical and 

Which of the following is a periodic change?

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(a) The change of the phases of the moon

(b) The charring of sugar
(c)The curdling of milk

(d) The clotting of blood

Answer :  

(a) The change of the phases of the moon

Question 3

During which of the following changes are no new substances formed ?

(a) Photosynthesis

(b) Sublimation

(c) Respiration

(d) Burning

Answer :  

(b) Sublimation

Question 4

In which ot the following processes is light absorbed?

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(a) Sublimation

(b) Burning

(c) Photosynthesis

(d) Rusting

Answer :  

(c) Photosynthesis

Question 5

Which of the following is an exothermic change?

(a) The melting of ice

(b) The freezing of water

(c) The vaporisation of water

(d) The dissolution of glucose in water

Answer :  

(b) The freezing of water

Question 6  ICSE Class-8th Essential Physical and 

Which of the the following is an endothermic change

(a) The slaking of lime

(b) The burning of wood

(c) The melting of iron
(d) Respiration

Answer :  

(c) The melting of iron

Fill in the blanks :

1. When a solid dissolves in a liquid, the volume of the liquid … does not change …. (changes/does not change)

2 Photosynthesis is a .. chemical .. change. (physical/chemical)

3. The vaporisation of water is an .. endothermic .. change. (endothermic/exothermic)

4. When burnt, CNG forms carbon dioxide and .. water vapour .. (hydrogen/water vapour)

5. Iron combines with oxygen and .. moisture.. oft the air to form rust. (nitrogen/moisture)

6. The kinetic energy of molecules .. increases .. when a solid melts. (increases/decreases)

Write T for true and F for false for the following statements.

1. A physical change is irreversible.  false 

2 A chemical change is reversible.  false 

3. The mass of a substance undergoing a physical change is not altered.  true 

4. Heat is absorbed when glucose is dissolved in water.  false 

5. Heat is evolved when concentrated hydrochloric acid is poured into water.  true 

6. The slaking of lime is an endothermic change.  false 

-: End of ICSE Class-8th Physical and Chemical Changes Essential Chemistry Ch-2 Bharti Bhawan Solutions :-


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