Preparation and Properties of Hydrogen, Oxygen, Nitrogen and Carbon dioxide, Oxidation and Reduction NDA Questions

NDA Chemistry

Preparation and Properties of Hydrogen, Oxygen, Nitrogen and Carbon dioxide, Oxidation and Reduction MCQ Questions


1.
Hydrogen is the most abundant element in the universe and is placed at the top of the periodic table because it resembles:
A.
The noble gases (Group 18)
B.
Only the halogens (Group 17)
C.
Only the alkali metals (Group 1)
D.
Both alkali metals and halogens, depending on the property considered
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ANSWER :
D. Both alkali metals and halogens, depending on the property considered
2.
On Earth, hydrogen is rarely found in the free (elemental) state and mostly occurs in the combined state, most abundantly as a constituent of:
A.
Common salt
B.
Metal ores
C.
Limestone
D.
Water
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ANSWER :
D. Water
3.
The three naturally occurring isotopes of hydrogen are:
A.
Protium, helium and tritium
B.
Protium, deuterium and tritium
C.
Protium, deuterium and neon
D.
Deuterium, oxygen and tritium
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ANSWER :
B. Protium, deuterium and tritium
4.
Which isotope of hydrogen is radioactive?
A.
Deuterium
B.
None of the isotopes are radioactive
C.
Tritium
D.
Protium
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ANSWER :
C. Tritium
5.
Heavy water, used as a moderator in nuclear reactors, has the chemical formula:
A.
H2O2
B.
T2O
C.
H2O
D.
D2O
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ANSWER :
D. D2O
6.
The most common isotope of hydrogen, having a nucleus with just one proton and no neutron, is called:
A.
Deuterium
B.
Protium
C.
Tritium
D.
Positronium
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ANSWER :
B. Protium