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The violet colour obtained during test o...

The violet colour obtained during test of sulphur in the Lassaigne's test is formed due to reaction of `Na_2S` with

A

`Na_2[Fe(CN)_5S]`

B

`Na_2[Fe(CN)_5NO]`

C

`Na_2[Fe(CN)_5NOS]`

D

`K_4[Fe(CN)_6]`

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