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Detection of Elements: Lassaigne’s Test
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Assignments:

 

1. The blue colour confirms the presence of nitrogen in an organic compound is due to the formation of

a. Fe4[Fe(CN)6]3
b. Na4[Fe(CN)6]
c. NaCNS
d. Na4[Fe(CN)5NOS]

 

2. Which of the following sodium fusion extract of organic compound gives brilliant violet color with sodium nitroprusside solution?

a. Urea
b. Thiourea
c. Benzoic acid
d. Aniline

 

3. Which of the following reagent is used to distinguish halogens (Cl, Br, I) in an organic compound?

a. NH4OH
b. NaOH
c. FeCl3
d. H2SO4

 

Answers:

 

1. (a)      2. (b)       3. (a)

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