In the following question, a statement of assertion is followed by a statement of reason. Choose the correct answer out of
the following choices.
Assertion: The air is a compound containing oxygen and nitrogen in a fixed proportion according to their masses.
Reason: A mixture is a substance composed of two or more elements, chemically combined with one another in a fixed
proportion
A) Both assertion and reason are correct and the reason is the correct explanation of the assertion.
B) Both assertion and the reason are correct but the reason is not the correct explanation of the assertion.
C) Assertion is true but the reason is false.
D) Both assertion and reason are false statements.
Answers
Answer:
C)
Explanation:
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Answer:
Solution
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Correct option is
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Air is a mixture because:
(i) The properties of the constituents of air (oxygen, nitrogen, carbon dioxide etc.) are not changed. For example, pure oxygen is a supporter of combustion. Oxygen present in the air also supports combustion. Pure carbon dioxide turns lime water milky. Carbon dioxide present in the air also turns lime water milky.
(ii) The proportions of the constituents of air vary from place to place. Even in the same place, the proportion varies from time to time. In a compound, the proportions of different constituents always remain fixed.
(iii) On distillation of liquefied air, nitrogen distills off first, leaving behind oxygen in the liquid form. This is the characteristic of a mixture, not of a compound.
(iv) No thermal change occurs when the constituents of air (oxygen, nitrogen etc.) are mixed together.
(v) Liquid air does not have a fixed boiling point. This is the characteristic of a mixture, not of a compound
Explanation:
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