Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 18

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Weekly Quiz Competition

Question 1
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Which of the following statements are true for pure substances?

(i) Pure substances contain only one kind of particles

(ii) Pure substances may be compounds or mixtures

(iii) Pure substances have the same composition throughout

(iv) Pure substances can be exemplified by all elements other than nickel

A
(i) and (ii)

B
(i) and (iii)

C
(iii) and (iv)

D
(ii) and (iii)

Solution

Pure substances are made up of only one kind of particles and they have same composition throughout. Mixtures are not pure substances. Only elements and compounds are pure substances.
Question 2
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Rusting of an article made up of iron is called

A
Corrosion and it is a physical as well as chemical change

B
Dissolution and it is a physical change

C
Corrosion and it is a chemical change

D
Dissolution and it is a chemical change

Solution

Rusting of iron is a chemical change. It leads to the corrosion of iron.
Question 3
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A mixture of sulphur and carbon disulphide is

A
Heterogeneous and shows Tyndall effect

B
Homogeneous and shows Tyndall effect

C
Heterogeneous and does not show Tyndall effect

D
Homogeneous and does not show Tyndall effect

Solution

Sulphur is soluble in carbon disulphide hence, a solution is formed when sulphur is mixed with carbon disulphide. Solution is homogeneous and does not show Tyndall effect.
Question 4
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Tincture of iodine has antiseptic properties. This solution is made by dissolving

A
Iodine in potassium iodide

B
Iodine in vaseline

C
Iodine in water

D
Iodine in alcohol

Solution

A solution of "Tincture of Iodine" is made by dissolving 2 - 7% iodine in alcohol. Tincture solutions are characterised by the presence of alcohol since alcohol is a good solvent. Iodine does not dissolve in water. Tincture of Iodine is used as an antiseptic.
Question 5
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Which of the following are homogeneous in nature?

(i) ice

(ii) wood

(iii) soil

(iv) air

A
(i) and (iii)

B
(ii) and (iv)

C
(i) and (iv)

D
(iii) and (iv)

Solution

Ice and air are homogeneous in nature since they have same composition throughout and there are no visible boundaries between the components.
Question 6
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Which of the following are physical changes?

(i) Melting of iron metal

(ii) Rusting of iron

(iii) Bending of an iron rod

(iv) Drawing a wire of iron metal

A
(i), (ii) and (iii)

B
(i), (ii) and (iv)

C
(i), (iii) and (iv)

D
(ii), (iii) and (iv)

Solution

Rusting of iron is a chemical change. A new substance (iron oxide) is formed in case of rusting of iron. In the other options, no new substance is formed; they are physical changes.
Question 7
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Which of the following are chemical changes?

(i) Decaying of wood

(ii) Burning of wood

(iii) Sawing of wood

(iv) Hammering of a nail into a piece of wood

A
(i) and (ii)

B
(ii) and (iii)

C
(iii) and (iv)

D
(i) and (iv)

Solution

Decaying of wood and burning of wood are chemical changes since there is a change in chemical composition of wood. Sawing of wood and hammering of a nail into a piece of wood are physical changes since there is no change in the composition of the wood during these changes.
Question 8
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Two substances, A and B were made to react to form a third substance, \(A_2B\) according to the following reaction

\(2A + B \rightarrow A_2 B \)

Which of the following statements concerning this reaction are incorrect?

(i) The product \(A_2B\) shows the properties of substances A and B

(ii) The product will always have a fixed composition

(iii) The product so formed cannot be classified as a compound

(iv) The product so formed is an element

A
(i), (ii) and (iii)

B
(ii), (iii) and (iv)

C
(i), (iii) and (iv)

D
(ii), (iii) and (iv)

Solution

The properties of the compound \(A_2B\) (product formed as a result of the reaction) are different from the properties of its constituent elements - "A" and "B". \(A_2B\) will always have "A" and "B" in fixed composition by mass.
Question 9
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Two chemical species X and Y combine together to form a product P which contains both X and Y

X + Y → P

X and Y cannot be broken down into simpler substances by simple chemical reactions.

Which of the following concerning the species X, Y and P are correct?

(i) P is a compound

(ii) X and Y are compounds

(iii) X and Y are elements

(iv) P has a fixed composition

A
(i), (ii) and (iii)

B
(i), (ii) and (iv)

C
(ii), (iii) and (iv)

D
(i), (iii) and (iv)

Solution

X + Y→P

X and Y are elements hence, cannot be broken down into simpler substances. P is a compound hence it has fixed composition.
Question 10
1 / -0

A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called _______.

A
Centrifugation

B
Heterogeneous

C
Fractional distillation

D
Evaporation

Solution

A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called fractional distillation.

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Is Matter Around Us Pure Test - 18

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Is Matter Around Us Pure Test - 18

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Question 1

(i) and (ii)

(i) and (iii)

(iii) and (iv)

(ii) and (iii)

Solution

Question 2

Corrosion and it is a physical as well as chemical change

Dissolution and it is a physical change

Corrosion and it is a chemical change

Dissolution and it is a chemical change

Solution

Question 3

Heterogeneous and shows Tyndall effect

Homogeneous and shows Tyndall effect

Heterogeneous and does not show Tyndall effect

Homogeneous and does not show Tyndall effect

Solution

Question 4

Iodine in potassium iodide

Iodine in vaseline

Iodine in water

Iodine in alcohol

Solution

Question 5

(i) and (iii)

(ii) and (iv)

(i) and (iv)

(iii) and (iv)

Solution

Question 6

(i), (ii) and (iii)

(i), (ii) and (iv)

(i), (iii) and (iv)

(ii), (iii) and (iv)

Solution

Question 7

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

Solution

Question 8

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i), (iii) and (iv)

(ii), (iii) and (iv)

Solution

Question 9

(i), (ii) and (iii)

(i), (ii) and (iv)

(ii), (iii) and (iv)

(i), (iii) and (iv)

Solution

Question 10

Centrifugation

Heterogeneous

Fractional distillation

Evaporation

Solution

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