The colour of the solution/precipitate obtained in the elemental analysis of an organic compound...

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The colour of the solution/precipitate obtained in the elemental analysis of an organic compound and the molecule/ion responsible for the colour are given below. Choose the incorrectly matched pair :
(A) Prussian blue \( -\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3} x \mathrm{H}_{2} \mathrm{O} \)
(B) Black - PbS
(C) Violet colour \( -\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}\right]^{4-} \)
(D) Blood red colour \( -[\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
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