The P-Block Elements NDA Questions

NDA Chemistry

The P-Block Elements MCQ Questions


7.
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
8.
Direct oxidation of C in limited supply of oxygen or air yields
A.
Carbon monoxide
B.
Carbon dioxide
C.
Both a and b
D.
Carbon tetroxide
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ANSWER :
A. Carbon monoxide
9.
Dry air contains _____% oxygen by volume.
A.
20.946
B.
32.098
C.
1.765
D.
12.893
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ANSWER :
A. 20.946
10.
The carbonates of lithium and magnesium decompose easily on heating to form the _____
A.
Oxides
B.
Carbon dioxide
C.
Both a and b
D.
Amino
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ANSWER :
C. Both a and b
11.
Magnesium carbonate is an ingredient of ______
A.
Face cream
B.
Tooth paste
C.
Hair oil
D.
Talcum powder
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ANSWER :
B. Tooth paste
12.
Carbon is the _____ most abundant element by mass in the earth’s crust
A.
20th
B.
17th
C.
12th
D.
16th
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ANSWER :
B. 17th