Exercise: Chemistry

Questions for: Chemistry

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: A
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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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: C
No answer description is available. Let's discuss.
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The inherited traits of an organism are controlled by
A:
RNA molecules
B:
nucleotides
C:
DNA molecules
D:
enzymes
Answer: C
No answer description is available. Let's discuss.
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The ore which is found in abundance in India is
A:
monazite
B:
fluorspar
C:
bauxite
D:
magnetite
Answer: A
No answer description is available. Let's discuss.
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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: C
No answer description is available. Let's discuss.
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