19.
The most abundant rare gas in the atmosphere is
A. He B. Ne
C. Ar D. Xe
Answer & Explanation
Answer: Option C
Explanation:
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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 & Explanation
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 & Explanation
Answer: Option A
Explanation:
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22.
The inherited traits of an organism are controlled by
A. RNA molecules
B. nucleotides
C. DNA molecules
D. enzymes
Answer & Explanation
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 & Explanation
Answer: Option C
Explanation:
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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 & Explanation
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.