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


1.
When an organic compound is heated with dry copper(II) oxide, carbon is oxidised to CO2 and hydrogen to H2O. Which reagent is used to confirm the presence of CO2?
A.
Anhydrous CuSO4
B.
Lime water [Ca(OH)2]
C.
Silver nitrate solution
D.
Lead acetate solution
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ANSWER :
B. Lime water [Ca(OH)2]
2.
Anhydrous copper sulphate is used in the test for detection of which element in an organic compound?
A.
Carbon
B.
Nitrogen
C.
Sulphur
D.
Hydrogen
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ANSWER :
D. Hydrogen
3.
In the test for carbon and hydrogen, the organic compound is heated with:
A.
Sodium metal
B.
Concentrated H2SO4
C.
Fuming nitric acid
D.
Copper(II) oxide
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ANSWER :
D. Copper(II) oxide
4.
Lassaigne's test is used to detect:
A.
Only carbon and hydrogen
B.
Only oxygen
C.
Nitrogen, sulphur, halogens and phosphorus
D.
Only nitrogen
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ANSWER :
C. Nitrogen, sulphur, halogens and phosphorus
5.
Why is sodium metal used in Lassaigne's test for detection of N, S and halogens?
A.
It acts as a catalyst
B.
It converts covalently bonded elements into ionic form
C.
It removes oxygen from the compound
D.
It increases the melting point
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ANSWER :
B. It converts covalently bonded elements into ionic form
6.
The sodium fusion extract is also called:
A.
Lassaigne's extract
B.
Kjeldahl's extract
C.
Carius extract
D.
Dumas extract
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ANSWER :
A. Lassaigne's extract