If on adding \( \mathrm{FeCl}_{3} \) solution to acidified Lassaignes solution, a blood red colo...

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If on adding \( \mathrm{FeCl}_{3} \) solution to acidified Lassaignes solution, a blood red colouration is produced, it indicates the presence of -
(a) \( \mathrm{S} \)
(b) \( \mathrm{N} \)
(c) \( \mathrm{N} \) and \( \mathrm{S} \)
(d) \( \mathrm{S} \) and \( \mathrm{Cl} \)
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