Numerical Problems in Organic Quantitative Analysis NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Numerical Problems in Organic Quantitative Analysis MCQ Questions


7.
0.6 g of an organic compound on combustion gave 0.88 g of COâ‚‚. Find the percentage of carbon:
A.
80%
B.
20%
C.
60%
D.
40%
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ANSWER :
D. 40%
8.
0.92 g of an organic compound containing C, H, and O on combustion gave 1.76 g of COâ‚‚ and 1.08 g of Hâ‚‚O. The percentage of oxygen is:
A.
52.17%
B.
47.83%
C.
34.78%
D.
13.04%
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ANSWER :
C. 34.78%
9.
An organic compound contains 40% C and 6.67% H. The percentage of oxygen is (assuming only C, H, O):
A.
53.33%
B.
50.33%
C.
63.33%
D.
46.67%
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ANSWER :
A. 53.33%
10.
0.36 g of an organic compound containing C, H, and O on combustion gave 0.528 g of COâ‚‚ and 0.216 g of Hâ‚‚O. The percentage of oxygen is:
A.
46.67%
B.
53.33%
C.
40.00%
D.
60.00%
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ANSWER :
B. 53.33%
11.
In Dumas method, 0.3 g of an organic compound gave 50 mL of Nâ‚‚ collected at 300 K and 715 mm pressure (aqueous tension at 300 K = 15 mm). The percentage of nitrogen is:
A.
8.73%
B.
34.92%
C.
26.19%
D.
17.46%
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ANSWER :
D. 17.46%
12.
In Dumas method, 0.42 g of an organic compound gave 60 mL of N₂ at 27°C and 750 mm pressure (aqueous tension at 27°C = 26.7 mm). The percentage of N is approximately:
A.
33.00%
B.
8.25%
C.
16.50%
D.
11.00%
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ANSWER :
C. 16.50%