Hydrogen NDA Questions

NDA Chemistry

Hydrogen MCQ Questions


13.
Dihydrogen is the most abundant element in the universe, constituting approximately what percentage of its total mass?
A.
About 10%
B.
About 30%
C.
More than 70%
D.
About 50%
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ANSWER :
C. More than 70%
14.
On Earth, hydrogen occurs mainly not as free dihydrogen gas but in a:
A.
Solid metallic form only
B.
Pure elemental gaseous form only
C.
Liquid form at room temperature
D.
Combined form, such as in water and organic compounds
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ANSWER :
D. Combined form, such as in water and organic compounds
15.
The three naturally occurring isotopes of hydrogen are protium, deuterium and:
A.
Muonium
B.
Positronium
C.
Helium-3
D.
Tritium
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ANSWER :
D. Tritium
16.
The mass number of protium, the most common and abundant isotope of hydrogen, is:
A.
0
B.
1
C.
2
D.
3
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ANSWER :
B. 1
17.
Deuterium, an isotope of hydrogen, is commonly represented by the symbol:
A.
H⁺
B.
T (or ³H)
C.
D (or ²H)
D.
He
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ANSWER :
C. D (or ²H)
18.
Tritium, the radioactive isotope of hydrogen, is commonly represented by the symbol:
A.
H (or ¹H)
B.
He-3
C.
T (or ³H)
D.
D (or ²H)
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ANSWER :
C. T (or ³H)