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Violet coloured complex obtained in the detection of
P sulphur is:
(1) \( \mathrm{Na}_{2}\left[\mathrm{Fe}(\mathrm{NO})(\mathrm{CN})_{5}\right] \)
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(2) \( \mathrm{Na}_{3}\left[\mathrm{Fe}(\mathrm{ONS})\left(\mathrm{CN}_{5}\right)\right] \)
(3) \( \mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}\right] \)
(4) Both (2) and (3)
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