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.
Pure hydrogen of very high purity can be prepared in the laboratory by the electrolysis of a warm, dilute solution of:
A.
Sodium chloride
B.
Barium hydroxide (using nickel electrodes)
C.
Copper sulphate
D.
Silver nitrate
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ANSWER :
B. Barium hydroxide (using nickel electrodes)
14.
Hydrogen gas is:
A.
Coloured and has a pungent odour
B.
Coloured but odourless
C.
Colourless but has a strong smell
D.
Colourless, odourless and tasteless
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ANSWER :
D. Colourless, odourless and tasteless
15.
Hydrogen is the lightest of all gases known, which is why it was once used to fill:
A.
Oxygen cylinders
B.
Refrigerators
C.
Fire extinguishers
D.
Balloons and airships
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ANSWER :
D. Balloons and airships
16.
Compared to air, hydrogen gas diffuses:
A.
Much faster, being the lightest gas with the smallest molecular mass
B.
It cannot diffuse at all
C.
At exactly the same rate
D.
Much more slowly, being a heavier gas
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ANSWER :
A. Much faster, being the lightest gas with the smallest molecular mass
17.
Hydrogen gas is collected in the laboratory by the method of downward displacement of water because it is:
A.
Denser than water
B.
Highly soluble in water
C.
Reactive with water at room temperature
D.
Only slightly soluble in water
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ANSWER :
D. Only slightly soluble in water
18.
When a burning splint is brought near a test tube of hydrogen gas, it burns with a characteristic sound and a pale blue flame. This sound is described as a:
A.
Pop sound
B.
Crackling sound
C.
No sound at all
D.
Hissing sound
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ANSWER :
A. Pop sound