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What is/are the important uses of alkali or metal alkali?

What is/are the important uses of alkali or metal alkali? Correct Answer All of the mentioned

The important uses of alkali or metal sulphides are: (1) preparation of nitroamines from dinitro compounds, (2) reduction of nitrophenols (3) reduction of nitroanthraquinones, and (4) preparation of aminoazo compounds from the corresponding nitro derivatives.

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