Question

In Lassaigne's test, sodium metal is used because :

• A. it is very reactive.
• B. its melting point is low.
• C. its compounds are soluble in water.
• D. All of the above

Answer 1

The correct option is D All of the above

Lassaigne's test is used to detect the presence of elements: Nitrogen (N), Sulfur (S), Chlorine (Cl), Bromine (Br) and Iodine (I).

This test involves the following two steps:

i) Preparation of sodium fusion extract (SFE).

ii) Detection of elements using SFE.

Na is used because

1. it is very reactive

2. its melting point is low

3. its compounds are soluble in water

Hence, all the given options are correct.