In basic dyes which of the following group is present? (1) \( -\mathrm{NO}_{2} \) (2) \( -\mathr...
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In basic dyes which of the following group is present?
(1) \( -\mathrm{NO}_{2} \)
(2) \( -\mathrm{SO}_{3} \mathrm{OH} \)
(3) \( -\mathrm{OH} \)
(4) \( -\mathrm{NH}_{2} \)
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