The S-Block Elements NDA Questions

NDA Chemistry

The S-Block Elements MCQ Questions


7.
Strictly, ______ belongs to the s-block but its positioning in the p-block along with other group 18 elements is justified because it has a completely filled valence shell (1sĀ²)
A.
Lithium
B.
Helium
C.
Hydrogen
D.
Carbon
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ANSWER :
B. Helium
8.
Fullerenes are made by the heating of graphite in an electric arc in the presence of inert gases such as _____
A.
Helium
B.
Argon
C.
Either a or b
D.
Oxygen
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ANSWER :
C. Either a or b
9.
It was found that the Law of Octaves was applicable only up to _____ as after that every eighth element did not possess properties similar to that of the first.
A.
Calcium
B.
Lithium
C.
Carbon
D.
Hydrogen
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ANSWER :
A. Calcium
10.
According to Newlands, how many elements were existed in nature?
A.
115
B.
100
C.
94
D.
56
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ANSWER :
D. 56
11.
Which of the following are the impurities that could be found in crude sodium chloride?
A.
Sodium sulphate
B.
Calcium sulphate
C.
Calcium chloride
D.
All the above
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ANSWER :
D. All the above
12.
______ metal/s, owing to their reactivity with oxygen and nitrogen at elevated temperatures, have often been used to remove air from vacuum tubes
A.
Calcium
B.
Barium
C.
Both a and b
D.
Beryllium
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ANSWER :
C. Both a and b