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Which of the following colour reagents are used in Resin column chromatography?

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Which of the following colour reagents are used in Resin column chromatography?

(a) Marquis reagent

(b) Benedict reagent

(c) Ninhydrin

(d) Nessler’s reagent

I had been asked this question during an interview.

This intriguing question originated from Amino-Acid Analysers in section Chromatography of Analytical Instrumentation

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The correct choice is (d) Nessler’s reagent

For explanation I would say: Ninhydrin is the colour reagent used in resin column chromatography. The colour reaction occurs during a known period and controlled temperature.

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