Maharashtra Board Class 8 Science MCQ on Chapter 13 Chemical Change and Chemical Bond

1 ) Which of the following is a chemical change ?

A ) Boiling of water

B ) Bursting of an inflated balloon

C ) Souring of milk

D ) Dissolution of salt in water.

Ans C ) Souring of milk

2 ) Which of the following is an example of an ionic compound?

A ) H2

B ) O2

C ) H2O

D ) NaCl

Ans D ) NaCl

3 ) Two atoms of same element always form

A ) Ionic bond

B ) Covalent bond

C ) Strong bond

D ) Electrovalent bond

Ans B ) Covalent bond

4 ) Which of the following substances is used in the cold drink called ‘soda lemon’ ?

A ) Baking soda B ) Washing soda C ) Lime water

D ) Lime stone

Ans A ) Baking soda

5 ) Baking soda with lemon juice releases which gas?

A ) O2 B ) CO2 C ) H2

D ) HCl

Ans B ) CO2

6 ) Hard water contains the chloride and sulphate salts of …………… and in dissolved state.

A ) Calcium and magnesium

B ) Calcium and sodium

C ) Sodium and magnesium

D ) Sulfur and magnesium

Ans A ) Calcium and magnesium

7 ) Shahabad tile is cleaned with concentrated hydrochloric acid.

A ) True

B ) False

Ans B ) False

8 ) Citric acid with sodium bicarbonate give which salt?

A ) Sodium chloride

B ) Citric oxide

C ) Sodium citrate

D ) Citric carbonate

Ans C ) Sodium citrate

9 ) Wood, coal, petrol or cooking gas are burnt for getting …………….

A ) Fuel

B ) Nitrogen

C ) Energy

D ) Electricity

Ans C ) Energy

10 ) Find the odd one out.

A ) NaCl B ) H2O C ) MgCl2 D ) KCl

Ans B ) H2O

11 ) New substances formed as a result of the reaction are called …………….

A ) Reactants

B ) Original substances

C ) Producers

D ) Products

Ans D ) Products

12 ) Which of the following is a manmade chemical change ?

A ) Respiration

B ) Photosynthesis

C ) Foul smell from a spoiled food

D ) Softening of water.

Ans D ) Softening of water.

13 ) Chemical name of baking soda is …………… .

A ) Sodium chloride

B ) Sodium carbonate

C ) Calcium hydroxide

D ) Sodium bicrbonate

Ans D ) Sodium bicrbonate

14 ) Freshly prepared solution of calcium hydroxide in water is called …………… .

A ) Baking soda B ) Soda water C ) Lime water D ) Lime stone

Ans C ) Lime water

15 ) Which of the following substances react with oxygen in respiration?

A ) Glucose

B ) Carbon dioxide

C ) Water

D ) Carbon

Ans A ) Glucose

16 ) Which of the following is an ionic compound ?

A ) H2 B ) H2O C ) KF

D ) HCl

Ans C ) KF

17 ) The chemical bond formed by sharing of valence electrons of two atoms with each other is called a ……………

bond.

A ) Ionic

B ) Anionic

C ) Electrovalent

D ) Covalent

Ans D ) Covalent

18 ) Respiration increases the amount of gas in the body.

A ) O2 B ) CO2 C ) H2

D ) HCl

Ans B ) CO2

19 ) During respiration, in the body is used up to produce energy.

A ) Water

B ) Glucose C ) Starch D ) Carbon

Ans B ) Glucose

20 ) During any …………… change, composition of original substance changes to form new substance with a different composition and properties.

A ) Chemical B ) Natural C ) Physical

D ) Mechanical

Ans A ) Chemical

21 ) Acid and alkali reaction is known as ……………

A ) Decomposition

B ) Oxidation

C ) Neutralization

D ) Dissociation

Ans C ) Neutralization

22 ) What happens when carbon dioxide reacts with freshly prepared lime water ?

A ) The lime water turns milky.

B ) The solution remains colourless.

C ) Oxygen gas is released.

D ) The chemical composition of the lime water does not change.

Ans A ) The lime water turns milky.

23 ) The compound formed by means of one or more ionic bonds is called …………….

A ) Ionic compound

B ) Covalent compound C ) Valence compound D ) Anion

Ans A ) Ionic compound

24 ) An ion forms the same number of ionic bonds as its ……………

A ) Electrons

B ) Configuration

C ) Valency

D ) Size

Ans C ) Valency

25 ) The common substance that burns in all the fuels is ‘… ‘.

A ) Carbon

B ) Hydrogen C ) Oxygen D ) Chlorine

Ans A ) Carbon

26 ) The electronic configuration of sodium is …………… .

A ) (2, 8, 8, 1)

B ) (2, 8, 1)

C ) (2, 8, 8, 2)

D ) (2, 8, 2)

Ans B ) (2, 8, 1)

27 ) Respiration is a continuously occurring biological process.

A ) True

B ) False

Ans A ) True

28 ) Which of the following is NOT a chemical change ?

A ) Digestion of food

B ) Formation of water vapour from liquid water.

C ) Baking of a cake

D ) Changing colour of fallen leaves

Ans B ) Formation of water vapour from liquid water.

29 ) In MgCl2, charge on Cl is ……………

A ) -1

B ) +1

C ) -2

D ) +2

Ans A ) -1

30 ) There are electrons in the valence shell of oxygen atom.

A ) Six

B ) Five

C ) Two

D ) One

Ans A ) Six

31 ) When carbon dioxide gas reacts with freshly prepared lime water, the products formed are …………… .

A ) Calcium carbonate and oxygen B ) Calcium hydroxide and water C ) Calcium carbonate and water D ) Calcium hydroxide and oxygen

Ans C ) Calcium carbonate and water

32 ) Which of the following characteristics help to identify a chemical change when a pinch of baking soda is added to the lemon juice ?

A ) Colour and taste change

B ) Taste change and release of gas C ) Colour change and release of gas D ) Only colour change

Ans B ) Taste change and release of gas

 

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