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11 grade chemistry others

Which of the following constituent gas is not directly used by the living beings?

A. Oxygen

B. Nitrogen

C. Hydrogen

D. Carbon dioxide

Aniket Singh

10 Months agoGrade

1 Answer

Askiitians Tutor Team

Approved Tutor Answer10 Months ago

The gas that is not directly used by living beings is Nitrogen.

Explanation of Gases

Living organisms primarily utilize certain gases for various processes:

Oxygen: Essential for respiration in most living beings.
Carbon Dioxide: Used by plants during photosynthesis.
Hydrogen: Plays a role in various biochemical reactions.

Nitrogen's Role

While nitrogen is abundant in the atmosphere and is crucial for the formation of proteins and nucleic acids, it is not directly used in its gaseous form by living organisms. Instead, it must be converted into a usable form through processes like nitrogen fixation.

Which of the following is likely to be least stable?

(A) Ca₄₀

(B) Mn₅₅

(C) Sn₁₁₉

(D) Al₃₀

Grade 1111 grade chemistry others

1 Answer Available

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Which of the following is not a Lewis acid?

A. BF₃

B. AlCl₃

C. FeCl₃

D. PH₃

Grade 1111 grade chemistry others

1 Answer Available

Last Activity: 10 Months ago

Which of the following is not a property of compounds?

(A) They are made up of two or more kinds of atoms.

(B) They cannot be broken down into two or more simpler substances by physical means but by chemical means only.

(C) Properties of compounds differ from those of their elements.

(D) None of the above.

Grade 1111 grade chemistry others

1 Answer Available

Last Activity: 10 Months ago

Which of the following is polar?
A. NF₃
B. BF₃
C. SF₄
D. SiF₄

Grade 1111 grade chemistry others

1 Answer Available

Last Activity: 10 Months ago

Which of the following metals exists in their native state in nature?

(i) Ca

(ii) Au

(iii) Zn

(iv) Ag
A. (i) and (ii)
B. (ii) and (iii)
C. (ii) and (iv)
D. (iii) and (iv)

Grade 1111 grade chemistry others

1 Answer Available

Last Activity: 10 Months ago

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