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Sodium Anthraquinone-2-sulfonate is also called what?

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Sodium Anthraquinone-2-sulfonate is also called what?

(a) Zinc salt

(b) Silver salt

(c) Iron salt

(d) Potassium salt

I got this question during a job interview.

My question is from Technical Manufacturing of Amino Compound topic in section Amination by Ammonolysis of Unit Processes

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Right choice is (b) Silver salt

Explanation: The preparation of 2-aminoanthraquinone from “silver” salt i.e. Sodium Anthraquinone-2-sulfonate.

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