Qualitative and Quantitative Analysis (Estimation of Carbon, Hydrogen, Nitrogen,... ) NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Qualitative and Quantitative Analysis (Estimation of Carbon, Hydrogen, Nitrogen,... ) MCQ Questions


7.
Presence of nitrogen is confirmed by formation of
A.
Prussian blue
B.
White ppt
C.
Yellow ppt
D.
Red ppt
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ANSWER :
A. Prussian blue
8.
A black precipitate with lead acetate in sodium extract confirms
A.
Nitrogen
B.
Chlorine
C.
Phosphorus
D.
Sulphur
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ANSWER :
D. Sulphur
9.
Which gas is evolved on heating organic compound with CuO in estimation of carbon
A.
H₂O
B.
CO
C.
H₂
D.
CO₂
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ANSWER :
D. CO₂
10.
Estimation of nitrogen by Dumas method involves
A.
Precipitation
B.
Reduction
C.
Hydrolysis
D.
Combustion
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ANSWER :
D. Combustion
11.
In Kjeldahl’s method, nitrogen is estimated as
A.
N₂
B.
NO₂
C.
NH₄⁺
D.
NH₃
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ANSWER :
D. NH₃
12.
Which acid is used in digestion in Kjeldahl's method?
A.
Acetic acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Sulphuric acid
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ANSWER :
D. Sulphuric acid