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


13.
What are the important minerals of aluminium?
A.
Bauxite
B.
Cryolite
C.
Aluminium sulphate
D.
Both a and b
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ANSWER :
D. Both a and b
14.
What are the less abundant elements in nature?
A.
Gallium
B.
Indium
C.
Thallium
D.
All the above
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ANSWER :
D. All the above
15.
Which of the following is a synthetically prepared radioactive element?
A.
Nihonium
B.
Cobalt
C.
Iron
D.
Nickel
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ANSWER :
A. Nihonium
16.
What is the colour of moist hydrogen?
A.
Green
B.
Violet
C.
Red
D.
White
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ANSWER :
D. White
17.
What is the maximum covalency of Boron?
A.
4
B.
3
C.
2
D.
1
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ANSWER :
A. 4
18.
Which of the following are the compounds of Boron?
A.
Borax
B.
Orthoboric acid
C.
Diborane
D.
All the above
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ANSWER :
D. All the above