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Question
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again.
What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain?
Solution
Soap is basic in nature because it turns the yellow turmeric stain reddish brown.
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