\( \mathrm{FeCl}_{3} \) solution gives blood red colour with \( \ma...

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\( \mathrm{FeCl}_{3} \) solution gives blood red colour with \( \mathrm{NH}_{4} \mathrm{SCN} \). If \( \mathrm{H}_{2} \mathrm{~S} \) gas is passed and filtered then filtrate does not give red colour with \( \mathrm{NH}_{4} \mathrm{SCN} \) Explain.
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