MCQ Maharashtra Board 8th science topic 6. Composition of Matter

1 ) Classify the following into solution, suspension and colloids Fog

A ) Solution

B ) Suspension

C ) Colloid

Ans C ) Colloid

2 ) The sweetness of milk is due to the ingredient called …………….

A ) Glucose

B ) Lactose

Ans B ) Lactose

3 ) All the smallest particles in an element or compound are alike.

A ) True

B ) False

Ans A ) True

4 ) Write the valency of the given elements.

Magnesium-Mg

A ) 1

B ) 2

C ) 3

Ans B ) 2

5 ) Atoms/ molecules of a are of two or more types.

A ) Compound

B ) Mixture

Ans B ) Mixture

6 ) Co-related terms

Chlorophyll : Magnesium :: Cobalt

A ) Cyanocobalamine

B ) hemoglobin

Ans A ) Cyanocobalamine

7 ) In water, the proportion of oxygen and hydrogen by weight is always ……………

A ) 1:8

B ) 8:1

Ans B ) 8:1

8 ) Solids show the property of elasticity.

A ) True

B ) False

Ans A ) True

9 ) Co-related terms

Cyanocobalamine : Complex Compound :: Limestone: ……………

A ) Organic compound

B ) Inorganic compound

Ans B ) Inorganic compound

10 ) The intermolecular force is in the particles of solid.

A ) Minimum B ) Moderate C ) Maximum D ) Indefinite

Ans C ) Maximum

 

11 ) Matter is classified into the types: mixture, compound and element, by applying the criterion …………… .

A ) States of matter

B ) Phases of matter

C ) Chemical composition of matter

D ) All of these

Ans C ) Chemical composition of matter

 

12) Bronze contains atoms of the element aluminium and copper.

A ) True

B ) False

Ans B ) False

 

13 ) Write the molecular formula of the given compound.

Magnesium chloride

A ) MgCl2

B ) MgCl

C )

Ans A ) MgCl2

14 ) Various atoms in the molecules of compounds are joined by bonds.

A ) Organic

B ) Chemical

Ans B ) Chemical

 

15 ) Find the odd one out A ) Hydrogen

B ) Sodium

C ) Potassium

D ) Carbon

Ans D ) Carbon

 

16 ) Which of the following forms a suspension?

A ) Water + Milk

B ) Water + Saw dust

C ) Water + Common salt

D ) Water + Blue vitriol

Ans B ) Water + Saw dust

 

16 ) When all the components of a mixture form one phase, it is called mixture.

A ) Homogeneous

B ) Heterogeneous

Ans A ) Homogeneous

 

17 ) Write the molecular formula of the given compound.

Calcium oxide

A ) CaO

B ) Ca2O

Ans A ) CaO

 

18 ) Classify the following into the types of solution.

Brass

A ) Solid in solid B ) Solid in liquid C ) Liquid in liquid

Ans A ) Solid in solid

 

19 ) Particles in liquid vibrate at their fixed positions.

A ) False

B ) True

Ans A ) False

 

20 ) Write the valency of the given elements.

Sodium-Na A ) 1

B ) 2

C ) 3

Ans A ) 1

21 ) O2 is a molecule of an element.

A ) False

B ) True

Ans B ) True

 

22 ) Classify the following into homogeneous or heterogeneous mixture.

Blue vitriol in water.

A ) Homogeneous

B ) Heterogeneous

Ans A ) Homogeneous

 

23 ) Deduce the molecular formula of the compounds formed from the following pairs of elements.

Hydrogen (valency-1) and Oxygen (valency-2).

A ) HO2

B ) H2O

Ans B ) H2O

 

24 ) A homogeneous mixture of two or more substances is called …………….

A ) Solution

B ) Suspension

C ) Colloid

Ans A ) Solution

25 ) The other components which are in less proportion than the solvent are called …………….

A ) Solute

B ) Solvent

Ans A ) Solute

26 ) Classify the following into mixture and compound.

A greyish color substance is obtained when iron filings and sulphur are mixed together in the dish.

A ) Compound

B ) Mixture

Ans B ) Mixture

27 ) Water, mercury and bromine are similar to each other, because three are …………… .

A ) Liquids

B ) Compounds

C ) Nonmetals

D ) Elements

Ans A ) Liquids

28 ) The smallest particle of matter is element.

A ) True

B ) False

Ans B ) False

29 ) Find the odd one out

A ) Carbohydrates

B ) Proteins

C ) Hydrocarbons

D ) Soda

Ans D ) Soda

30 ) The compounds that decompose on strong heating to leave a residue behind are called ……………

compounds.

A ) Organic B ) Inorganic C ) Complex

Ans B ) Inorganic

31 ) Classify the following into the types of solution.

Vinegar

A ) Solid in solid B ) Solid in liquid C ) Liquid in liquid

Ans C ) Liquid in liquid

32 ) Write the molecular formula of the given compound.

Methane

A ) CH4

B ) C4H

Ans A ) CH4

33 ) Heterogeneous mixture of a liquid and a solid is called a …………….

A ) Solution

B ) Suspension

C ) Colloid

Ans B ) Suspension

34 ) Classify the following into homogeneous or heterogeneous mixture.

Sand in water

A ) Homogeneous

B ) Heterogeneous

Ans B ) Heterogeneous

35 ) Brass is a compound made up of Copper and Zinc.

A ) False

B ) True

Ans A ) False

36 ) Each molecule of water contains two oxygen atoms joined to one atom of hydrogen.

A ) False

B ) True

Ans A ) False

37 ) Classify the following into mixture and compound.

A black-colored substance is obtained when iron filings and sulphur are heated together in the test tube.

A ) Compound

B ) Mixture

Ans A ) Compound

38 ) The smallest particles of an element contain identical atoms.

A ) False

B ) True

Ans B ) True

 

39 ) Classify the following into homogeneous or heterogeneous mixture.

Oil in water

A ) Homogeneous

B ) Heterogeneous

Ans B ) Heterogeneous

 

40 ) Classify the following into the types of solution.

Chlorinated water

A ) Gas in liquid B ) Solid in liquid C ) Liquid in liquid

Ans A ) Gas in liquid

 

41 ) is an inflammable gas.

A ) Hydrogen

B ) Oxygen

Ans A ) Hydrogen

 

42) Classify the following into homogeneous or heterogeneous mixture.

Acetone in water

A ) Homogeneous

B ) Heterogeneous

Ans A ) Homogeneous

 

43 ) Sugar is a common ingredient in most of the foodstuffs. It is …………… .

A ) An inorganic compound B ) An organic compound C ) A complex compound D ) A homogenous mixture

Ans B ) An organic compound

 

44 ) Molecular formula indicates the number of atoms of elements present in one molecule of a compound.

A ) True

B ) False

Ans A ) True

 

45 ) Find the odd one out

A ) Sugar

B ) Salt

C ) Baking soda

D ) Blue vitriol

Ans A ) Sugar

46 ) Write the molecular formula of the given compound.

Magnesium oxide

A ) MgO

B ) MgO2

Ans A ) MgO

 

47 ) Write the symbol/ molecular formulae of given substances Nitric oxide : ……………

A ) NO

B ) NO2

Ans A ) NO

 

48 ) Deduce the molecular formula of the compounds formed from the following pairs of elements.

Ferrous (valency 2) and Sulphur (valency 2)

A ) Fe2S2

B ) FeS

Ans B ) FeS

 

49 ) The distance between the particles is moderate in liquids.

A ) True

B ) False

Ans A ) True

 

50 ) Write the molecular formula of the given compound.

Iron oxide

A ) Fe2S

B ) FeS

Ans B ) FeS

 

51 ) Find the odd one out

A ) Chlorophyll B ) Hemoglobin C ) Glucose

D ) Cyanocobalamine

Ans C ) Glucose

 

52 ) Write the valency of the given elements.

Chlorine-Cl

A ) 1

B ) 7

C ) 3

Ans A ) 1

53 ) Classify the following into solution, suspension and colloids Ink

A ) Solution

B ) Suspension

C ) Colloid

Ans C ) Colloid

 

54 ) Classify the following into the types of solution Dilute HCl

A ) Solid in solid B ) Solid in liquid C ) Liquid in liquid

Ans C ) Liquid in liquid

 

55 ) Classify the following into mixture and compound.

Milk contains water, lactose fats, proteins and few more natural substances. A ) Compound

B ) Mixture

Ans B ) Mixture

 

56) Co-related terms

Blue Vitriol : Inorganic compound :: Cooking gas : ……………

A ) Complex compound

B ) Organic compound

Ans B ) Organic compound

 

57) The ingredient is naturally present in large proportion in milk.

A ) Fats

B ) Water

Ans B ) Water

 

58) Heterogeneous mixture in which the size of the particles is around 10-5m is called …………….

A ) Solution

B ) Suspension

C ) Colloid

Ans C ) Colloid

 

59 ) Match the following

Column-A

Column-B

i) Urea

a) Complex compound

ii) Rust

b) Organic compound

 

c) Inorganic compound

A )

Column-A

Column-B

 

i) Urea

Organic compound

 

ii) Rust

Inorganic compound

 

Column-A

Column-B

i) Urea

Complex compound

ii) Rust

Inorganic compound

B )

Ans

Column-A

Column-B

i) Urea

Organic compound

ii) Rust

Inorganic compound

A )

60 ) The proportion of constituent elements in a compound is ……………

A ) Varying

B ) Constant

Ans B ) Constant

 

61 ) Gases are incompressible.

A ) True

B ) False

Ans B ) False

 

62 ) Matter that contain two or more constituent substances is called …………… .

A ) Mixture

B ) Compound

C ) Element

D ) Metalloid

Ans A ) Mixture

 

63) All the gases present together constitute a phase.

A ) Single

B ) Separate

Ans A ) Single

 

64 ) Write the symbol/ molecular formulae of given substances.

Nitrogen molecule : ……………

A ) N,

B ) N2

Ans B ) N2

 

65 ) Write the valency of the given elements Bromine-Br

A ) 1

B ) 2

C ) 3

Ans A ) 1

 

66) Milk is an example of type of matter called …………… .

A ) Solution

B ) Homogeneous mixture C ) Heterogeneous mixture D ) Suspension

Ans C ) Heterogeneous mixture

 

67 ) Deduce the molecular formula of the compounds formed from the following pairs of elements.

Nitrogen (valency 3) and Hydrogen (valency 1)

A ) N3H

B ) NH3

Ans B ) NH3

 

68) Carbon dioxide molecule contains one atom of carbon and two atoms of oxygen.

A ) True

B ) False

Ans A ) True

 

69 ) Write the valency of the given elements.

Oxygen-O

A ) 2

B ) 4

C ) 6

Ans A ) 2

70 ) The part of matter having uniform composition is called …………….

A ) State

B ) Phase

Ans B ) Phase

71 ) Write the valency of the given elements.

Carbon-C

A ) 1

B ) 4

C ) 6

Ans B ) 4

72 ) Classify the following into homogeneous or heterogeneous mixture.

Sugar in water

A ) Homogeneous

B ) Heterogeneous

Ans A ) Homogeneous

 

73 ) Air is a mixture containing different gases.

A ) True

B ) False

Ans A ) True

 

74 ) Identify the chemical bonds between the given elements and compound.

Carbon dioxide

A ) 2

B ) 3

C ) 4

Ans C ) 4

 

75 ) Valency of carbon is 4 and that of oxygen is 2. From this, we understand that there are chemical

bond/bonds between the carbon atom and one oxygen atom in the compound-carbon dioxide.

A ) 1

B ) 2

C ) 3

D ) 4

Ans B ) 2

 

76 ) Liquids neither have definite shape nor definite volume.

A ) True

B ) False

Ans B ) False

 

77 ) Classify the following into the types of solution.

Hydrochloric acid

A ) Solid in liquid B ) Gas in liquid C ) Liquid in liquid

Ans B ) Gas in liquid

 

78 ) When the components of a mixture are distributed into two or more phases it is called a mixture.

A ) Homogeneous

B ) Heterogeneous

Ans B ) Heterogeneous

 

79 ) The properties of the constituent substances are retained in the ……………

A ) Compound

B ) Mixture

Ans B ) Mixture

 

80 ) Matter exists namely in three types.

A ) False

B ) True

Ans B ) True

 

81 ) The molecules of compounds have a complex structure formed by many atoms along with metal

atoms in the centre of this structure.

A ) Organic B ) Inorganic C ) Complex

Ans C ) Complex

 

82 ) Classify the following into mixture and compound.

Pure water is formed by chemical combination of the elements hydrogen and oxygen.

A ) Compound

B ) Mixture

Ans A ) Compound

 

83 ) Valency of an element remains constant in its various compounds.

A ) True

B ) False

Ans A ) True

 

84 ) The component of a solution which is present in the largest proportion is called …………….

A ) Solute

B ) Solvent

Ans B ) Solvent

 

85 ) Classify the following into solution, suspension and colloids.

Sugar syrup

A ) Solution

B ) Suspension

C ) Colloid

Ans A ) Solution

 

86) While making cakes or bread, we use baking soda to make it fluffy. Baking soda is a …………… .

A ) Compound

B ) Mixture

C ) Colloid

D ) Suspension

Ans A ) Compound

 

87 ) Intermolecular force of attraction is very weak in gases.

A ) False

B ) True

Ans B ) True

 

88 ) Identify the chemical bonds between the given elements and compound.

NaCl

A ) 1

B ) 2

C ) 3

Ans A ) 1

 

89 ) Write the valency of the given elements.

A ) Nitrogen-N

B ) 2

C ) 3

D ) 5

Ans C ) 3

 

90 ) A atoms forms as many chemical bonds with other atoms as its valency.

A ) False

B ) True

Ans B ) True

 

91 ) A liquid substance along with all the soluble substance dissolved in it together constitute a …………….

phase.

A ) Single

B ) Separate

Ans A ) Single

 

92 ) Solids retain their volume even when external pressure is applied. This property is called …………… .

A ) Plasticity

B ) Incompressibility

C ) Fluidity

D ) Elasticity

Ans B ) Incompressibility

 

93 ) Write the valency of the given elements Sulphur-S

A ) 2

B ) 3

C ) 4

Ans A ) 2

 

94 ) Classify the following into solution, suspension and colloids Saw dust in water

A ) Solution

B ) Suspension

C ) Colloid

Ans B ) Suspension

 

95 ) Liquids have fluidity and their shape changes in accordance with the container.

A ) True

B ) False

Ans A ) True

 

96 ) An intermolecular force of attraction acts between particles of matter.

A ) True

B ) False

Ans A ) True

 

97 ) If the combustion is not complete, black color carbon remains behind as residue. These compounds are called compounds.

A ) Organic B ) Inorganic C ) Complex

Ans A ) Organic

 

98 ) Write the symbol/ molecular formulae of given substances.

Oxygen molecule : ……………

A ) O

B ) O2

Ans B ) O2

 

99 ) Identify the chemical bonds between the given elements and compound.

Oxygen molecule

A ) 1

B ) 2

C ) 3

Ans B ) 2

 

100 ) Classify the following into solution, suspension and colloids Bronze

A ) Solution

B ) Suspension

C ) Colloid

Ans A ) Solution

 

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