Mechanical Engineering Exam > Mechanical Engineering Questions > Assertion (A): Air, a mixture of O2 and N2, i...
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Assertion (A): Air, a mixture of O2 and N2, is a pure substance.
Reason(R): Air is homogeneous in composition and uniform in chemical aggregation.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is NOT the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
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Assertion (A): Air, a mixture of O2 and N2, is a pure substance.Reason...
A pure substance is a substance of constant chemical composition throughout its mass.
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Assertion (A): Air, a mixture of O2 and N2, is a pure substance.Reason...
Assertion (A): Air, a mixture of O2 and N2, is a pure substance.
Reason (R): Air is homogeneous in composition and uniform in chemical aggregation.
To analyze the given assertion and reason, we need to understand the definitions and properties of a pure substance and air.
Definition of Pure Substance:
A pure substance is a substance that is composed of only one type of particle and cannot be separated into simpler substances by physical methods. It has a fixed composition and characteristic properties.
Definition of Air:
Air is a mixture of gases, primarily composed of oxygen (O2), nitrogen (N2), carbon dioxide (CO2), and traces of other gases. It is the natural atmosphere that surrounds the Earth and is essential for sustaining life.
Explanation:
Assertion (A): Air, a mixture of O2 and N2, is a pure substance.
This assertion is true. Air is not a pure substance because it is a mixture of different gases, including oxygen (O2) and nitrogen (N2). A pure substance would consist of only one type of particle, such as a single gas molecule.
Reason (R): Air is homogeneous in composition and uniform in chemical aggregation.
This reason is also true. Air can be considered homogeneous because it appears the same throughout and has a uniform composition. It is composed of a mixture of gases that are evenly distributed, and there are no visible concentration variations. Additionally, air exhibits uniform chemical aggregation, meaning that the different gases in air do not chemically react with each other or form separate phases.
Explanation of Reason as the Correct Explanation of Assertion:
The reason provided in the assertion is the correct explanation of the assertion. The homogeneous composition and uniform chemical aggregation of air are the reasons why it is not considered a pure substance.
Conclusion:
In conclusion, the assertion (A) that air, a mixture of O2 and N2, is a pure substance is false. The reason (R) provided, stating that air is homogeneous in composition and uniform in chemical aggregation, is the correct explanation of why air is not a pure substance.
Reason (R): Air is homogeneous in composition and uniform in chemical aggregation.
To analyze the given assertion and reason, we need to understand the definitions and properties of a pure substance and air.
Definition of Pure Substance:
A pure substance is a substance that is composed of only one type of particle and cannot be separated into simpler substances by physical methods. It has a fixed composition and characteristic properties.
Definition of Air:
Air is a mixture of gases, primarily composed of oxygen (O2), nitrogen (N2), carbon dioxide (CO2), and traces of other gases. It is the natural atmosphere that surrounds the Earth and is essential for sustaining life.
Explanation:
Assertion (A): Air, a mixture of O2 and N2, is a pure substance.
This assertion is true. Air is not a pure substance because it is a mixture of different gases, including oxygen (O2) and nitrogen (N2). A pure substance would consist of only one type of particle, such as a single gas molecule.
Reason (R): Air is homogeneous in composition and uniform in chemical aggregation.
This reason is also true. Air can be considered homogeneous because it appears the same throughout and has a uniform composition. It is composed of a mixture of gases that are evenly distributed, and there are no visible concentration variations. Additionally, air exhibits uniform chemical aggregation, meaning that the different gases in air do not chemically react with each other or form separate phases.
Explanation of Reason as the Correct Explanation of Assertion:
The reason provided in the assertion is the correct explanation of the assertion. The homogeneous composition and uniform chemical aggregation of air are the reasons why it is not considered a pure substance.
Conclusion:
In conclusion, the assertion (A) that air, a mixture of O2 and N2, is a pure substance is false. The reason (R) provided, stating that air is homogeneous in composition and uniform in chemical aggregation, is the correct explanation of why air is not a pure substance.
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Assertion (A): Air, a mixture of O2 and N2, is a pure substance.Reason(R): Air is homogeneous in composition and uniform in chemical aggregation.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?
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