Numerical Problems in Organic Quantitative Analysis NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Numerical Problems in Organic Quantitative Analysis MCQ Questions


13.
0.5 g of an organic compound on Dumas method gave 60 mL of Nâ‚‚ at STP. The percentage of nitrogen is:
A.
7.50%
B.
15.00%
C.
22.50%
D.
30.00%
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ANSWER :
B. 15.00%
14.
0.25 g of an organic substance gave 31.7 mL of moist nitrogen at 14°C and 758 mm pressure (aqueous tension at 14°C = 12 mm). Percentage of N is approximately:
A.
6.97%
B.
27.86%
C.
13.93%
D.
20.90%
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ANSWER :
C. 13.93%
15.
In Dumas estimation, 0.4 g of substance gave 22.4 mL of Nâ‚‚ at STP. The percentage of nitrogen is:
A.
7.00%
B.
14.00%
C.
21.00%
D.
3.50%
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ANSWER :
A. 7.00%
16.
0.5 g of an organic compound by Kjeldahl's method gave NH₃ which neutralized 10 mL of 1 M H₂SO₄. The percentage of nitrogen is:
A.
28.00%
B.
42.00%
C.
14.00%
D.
56.00%
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ANSWER :
D. 56.00%
17.
0.7 g of an organic compound by Kjeldahl's method evolved NH₃ which was absorbed in 100 mL of 0.5 N H₂SO₄. The unused acid required 80 mL of 0.5 N NaOH for neutralization. The percentage of nitrogen is:
A.
40%
B.
20%
C.
10%
D.
60%
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ANSWER :
B. 20%
18.
In Kjeldahl's method, 0.4 g of an organic compound liberates ammonia which neutralizes 10 mL of 1 M Hâ‚‚SOâ‚„. The percentage of nitrogen is:
A.
35.00%
B.
17.50%
C.
70.00%
D.
52.50%
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ANSWER :
C. 70.00%