chemistry general knowledge questions

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19. The most abundant rare gas in the atmosphere is
A. He B. Ne
C. Ar D. Xe

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.
20. The Latin word formica means ant. The name formic acid is derived from this Latin word because
A. this acid, in ancient times, was used to eliminate ant-hills
B. this corrosive acid is secreted by ants to drive away their enemies
C. this acid was first obtained by the distillation of ants
D. ants are attracted by the odour of this acid

Answer: Option C

Explanation:

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21. The ore which is found in abundance in India is
A. monazite B. fluorspar
C. bauxite D. magnetite

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.
22. The inherited traits of an organism are controlled by
A. RNA molecules
B. nucleotides
C. DNA molecules
D. enzymes

Answer: Option C

Explanation:

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23. The heat energy produced when the human body metabolises 1 gram of fat is
A. 30 KJ
B. 1 KJ
C. 39 KJ
D. 29 KJ

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.
24. What are the number of moles of CO2 which contains 16 g of oxygen?
A. 0.5 mole
B. 0.2 mole
C. 0.4 mole
D. 0.25 mole

Answer: Option A

Explanation:

One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.

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