Discussion
Assertion (A): Sodium alginate is used as the thickener for reactive printing.
Reason (R): It carries no hydroxyl groups available to react with the reactive dye.
Answer: D
Both are true and the reason gives the necessity: a starch thickener would consume dye and leave a stiff, poorly fixed print, so the choice of thickener is part of the dye selection. Starch is fine for pigment or vat printing.
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