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Lassaigne's test is used for detection of

(1) Nitrogen and Sulphur only 

(2) Nitrogen, Sulphur and Phosphorous Only 

(3) Phosphorous and halogens only 

(4) Nitrogen, Sulphur, phosphorous and halogens

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Best answer

(4) Nitrogen, Sulphur, phosphorous and halogens

Lassaigne's test is used for detection of all element N, S, P, X.

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