Organic Chemistry NDA Questions

NDA Chemistry

Organic Chemistry MCQ Questions


7.
On complete combustion, 0.246 g of an organic compound gave 0.198g of carbon dioxide and 0.1014g of water. Determine the percentage composition of oxygen.
A.
2.96%
B.
4.58%
C.
7.90%
D.
2.62%
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ANSWER :
B. 4.58%
8.
Which of the following are the types of chromatography?
A.
Adsorption chromatography
B.
Partition chromatography
C.
Fractional chromatography
D.
Both a and b
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ANSWER :
D. Both a and b
9.
On complete combustion, 0.246 g of an organic compound gave 0.198g of carbon dioxide and 0.1014g of water. Determine the percentage composition of carbon.
A.
10.86%
B.
22.09%
C.
12.90%
D.
21.95%
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ANSWER :
D. 21.95%
10.
What are the commonly used adsorbents?
A.
Silica gel
B.
Alumina
C.
Both a and b
D.
Camphor
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ANSWER :
C. Both a and b
11.
_____ involves separation of a mixture over a column of adsorbent (stationary phase) packed in a glass tube
A.
Thin Layer chromatography
B.
Column chromatography
C.
Fractional chromatography
D.
None of these
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ANSWER :
B. Column chromatography
12.
_____ involves separation of substances of a mixture over a thin layer of an adsorbent coated on glass plate.
A.
Fractional distillation
B.
Sublimation
C.
Partition chromatography
D.
Thin layer chromatography
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ANSWER :
D. Thin layer chromatography