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Qualitative Analysis of Organic Compounds
1. What is Lassaigne’s test extract called as?
a) Fusion extract
b) Sodium fusion extract
c) Lassaigne extract
d) Sodium extract
Answer: Sodium fusion extract
2. In the test for nitrogen, the sodium fusion extract is acidified with which of the following?
a) Dilute sulphuric acid
b) Dilute hydrochloric acid
c) Concentrated hydrochloric acid
d) Concentrated sulphuric acid
Answer: Concentrated sulphuric acid
3. What is the color of the precipitate obtained in the test for sulphur?
4. In case of both nitrogen and sulphur existence, Prussian blue is still the color of the end product.
5. A X color precipitate, which is Y in ammonium hydroxide indicates presence of chlorine. Identify X and Y.
a) X = yellowish, Y = soluble
b) X = yellow, Y = insoluble
c) X = white, Y = insoluble
d) X = white, Y = soluble
Answer: X = white, Y = soluble
6. Which is the oxidizing agent used in the test for phosphorous?
a) Hydrogen peroxide
b) Potassium nitrate
c) Sodium peroxide
d) Nitric acid
Answer: Sodium peroxide
7. Potassium can replace sodium in lassaigne’s test.
8. Carbon and hydrogen are detected by heating the compound with which of the following?
a) Copper (II)oxide
9. Which compound gets precipitated in the detection of carbon and hydrogen?
b) Carbon dioxide
c) Calcium carbonate
d) Copper sulphate
Answer: Calcium carbonate
10. Identify the element that cannot be detected by Lassaigne’s test.
Categories: Organic Chemistry – Basic Principles and Technique