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Q.

In Lassaigne's test, the organic compound is first fused with sodium metal. The sodium metal is used because

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a

All sodium salts are soluble in water

b

All sodium salts are not soluble in water

c

Sodium metal reacts with elements present in organic compounds to form inorganic compounds.

d

The melting point of sodium metal is low

answer is A, B, C.

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Detailed Solution

Lassaigne's test is used to detect the presence of elements: Nitrogen , Sulphur , Chlorine , Bromine  and Iodine

This test involves 

i) Preparation of sodium fusion extract (SFE). 

ii) Detection of elements using SFE.

Na is mainly used in this test because

1. it is very reactive

2. its melting point is low

3. its compounds are soluble in water

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