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15 Questions MCQ Test Science Class 9 - Test: Is Matter Around Us Pure- Assertion & Reason Type Questions

Test: Is Matter Around Us Pure- Assertion & Reason Type Questions for Class 9 2023 is part of Science Class 9 preparation. The Test: Is Matter Around Us Pure- Assertion & Reason Type Questions questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Is Matter Around Us Pure- Assertion & Reason Type Questions MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions below.
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Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 1
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion: Elements and compounds are pure substances.

Reason: Properties of compounds are different from those of its constituent elements.

Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 1
A pure substance may either contain constituent particles of only one kind or of different kinds. A pure substance has a fixed composition. Thus, elements and compounds are example of pure substances. Properties of compounds are different from those of its constituent elements.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 2
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : A mixture of acetone and methanol can be separated by fractional distillation.

Reason : The difference between their boiling points is very less.

Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 2
Whenever the difference in boiling points of two liquids is less than 25ºC they are separated by fractional distillation.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 3
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : To separate a mixture of two or more miscible liquids having the difference in boiling point less than 25 K,fractional  distillation process is used.

Reason : Distillation is a purification technique of separation of two or more miscible liquids.

Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 3

To separate a mixture of two or more miscible liquids for which difference in boiling point is less than 25K, fractional distillation process is used. It is a purification technique of separation of two or more miscible liquids.

Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 4
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : Tyndall effect is an optical property.

Reason : Electrophoresis is an electrical property.
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 4
Scattering of light by colloidal particles is an optical activity. Coagulation of colloidal particles under an electrical field is an electrical property.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 5
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : Cream can be separated from curd by centrifugation.

Reason : In centrifugation, immiscible liquids separate out in layers depending on their densities.
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 5
Cream can be separated from curd by centrifugation. In this technique, the denser particles are forced to settle at the bottom and the lighter particles stay at the top when spun rapidly.

In separating funnel technique, immiscible liquids separate out in layers depending on their densities.

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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : Impure benzoic acid can be purified by sublimation.

Reason : Benzoic acid sublimes on heating
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 6
Benzoic acid sublimes on heating while impurities do not.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 7
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : Burning a match stick is a chemical change.

Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 7
Burning a match stick is an irreversible (chemical) change because when we burn it, it produces smoke and turns into ash.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 8
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : A solution of table salt in a glass of water is homogeneous.

Reason : A solution having different composition throughout is homogeneous.
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 8
A solution having same composition throughout is homogeneous.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 9
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : When a beam of light is passed through a colloidal solution placed in a dark place the path of the beam becomes visible.

Reason : Light gets scattered by the colloidal particles
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 9
Light is scattered by colloidal particles, making the path of the beam visible.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 10
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : Colloidal solutions are stable and the colloidal particles do not settle down.

Reason : Brownian movement counters the force of gravity actively on colloidal particles.
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 10

Due to constant movement of particles colloidal particles do not settle down.

Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 11
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : A mixture of benzoic acid and naphthalene can be separated by crystallization from water.

Reason : Benzoic acid is soluble in hot water but naphthalene is insoluble in hot water
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 11
Benzoic acid is soluble in hot water but naphthalene is not soluble, hence separation can be carried out by hot water crystallisation.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 12
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : True solution exhibits Tyndall effect.

Reason : Particles are very large in size
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 12
True solutions do not exhibit Tyndall effect since the particle size is very small to scatter light.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 13
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : A solution of table salt in a glass of water is homogeneous.

Reason : A solution having different composition throughout is homogeneous.
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 13
A solution having same composition throughout is homogeneous.
Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 14
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : In sublimation, a substance changes directly from solid to vapour without passing through liquid state and vice-versa.

Reason : Distillation involves two processes i.e., vaporisation and condensation.
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 14

Explanation: Both the statements are correct. Sublimation is a process where a substance changes directly from solid to vapour without passing through liquid state. On the other hand, distillation is a process that involves vaporization and condensation. However, the reason does not explain the assertion as both are different processes. Sublimation is a single step process, while distillation is a two-step process.

Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 15
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion : A mixture of sugar and benzoic acid can be separated by shaking with ether.

Reason : Sugar is insoluble in water
Detailed Solution for Test: Is Matter Around Us Pure- Assertion & Reason Type Questions - Question 15

  • Sugar is soluble in water and insoluble in ether.

  • Higher ethers are insoluble in water because due to the bigger size of the alkyl groups, the oxygen atom in ethers fails to form intermolecular H-bonds with water.

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