Correct statement about chromatography: (a) It can be used to separate ortho and para nitro-anil...

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Correct statement about chromatography:
(a) It can be used to separate ortho and para nitro-anilines.
(b) It is used to separate blue and red dyes.
(c) It is used to purify plant pigments.
(d) It is used to separate compounds having dissimilar boiling points.
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