_ and are the two gases, which when taken together, make up about 99 percent of air.

I.Nitrogen II. carbon-di-oxide III. Noble gases IV. Oxygen

I and II

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I and III

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II and IV

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I and IV

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Solution

The correct option is D

I and IV

Nitrogen and oxygen are the main components of the atmosphere by volume. Together these two gases make up approximately 99% of the dry atmosphere.

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Question 14
Which of the following statement(s) is (are) true about respiration?

(i) During inhalation, ribs move inward and the diaphragm is raised.
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air.
(iii) Haemoglobin has a greater affinity for carbon dioxide than oxygen.
(iv) Alveoli increase surface area for exchange of gases.

(a) (i) and (iv)
(b) (ii) and(iii)
(c) (i) and (iii)
(d) (ii) and (iv)

Q. (a) Explain how, nitrogen , oxygen and argon gases are separated from air.
(b) Draw a flow diagram of the processes involved in obtaining gases like nitrogen, oxygen and argon from air.

Q. Which of the following gases combines with the blood and prevents it from carrying oxygen?
(a) carbon monoxide
(b) carbon dioxide
(c) nitrogen oxide
(d) nitrogen trioxide

Q. _______ of air is used to obtain nitrogen, oxygen, and argon and other atmospheric noble gases by separating the air components by fractional distillation in a cryogenic air separation unit.

Statement I: Air is a mixture of gases, water vapour and dust particles.

Statement II: Air is composed of only one gas that is nitrogen.

Statement III: Air is composed of two gases, nitrogen and oxygen only.

Which of the above statement is incorrect?

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_______ and ______ are the two gases, which when taken together, make up about 99 percent of air. I.Nitrogen II. carbon-di-oxide III. Noble gases IV. Oxygen

The correct option is D I and IV Nitrogen and oxygen are the main components of the atmosphere by volume. Together these two gases make up approximately 99% of the dry atmosphere.

_ and are the two gases, which when taken together, make up about 99 percent of air.

I.Nitrogen II. carbon-di-oxide III. Noble gases IV. Oxygen

The correct option is D

I and IV

Nitrogen and oxygen are the main components of the atmosphere by volume. Together these two gases make up approximately 99% of the dry atmosphere.