Multiple choice

Acne, eczema and psoriasis are some common skin diseases.The ammonium salt used in medicine as a remedy for treating such diseases is

  1. ammonium bituminosulphonate

  2. ammonium cerium(IV) sulphate

  3. ammonium dihydrogen phosphate

  4. ammonium fluorosilicate

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A Correct answer
Explanation

Ammonium bituminosulphonate is a product of natural origin obtained in the first step by dry distillation of sulphur-rich oil shale. It is used in medicine as a remedy for treating some skin diseases, such as acne, eczema and psoriasis.