Rohan had noticed Yellow spots of vegetable on his shirt. When he immersed his shirt into soap solution the yellow colour of spot changed into red. Why had it happened?
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(a) The natural indicator present in curry stain is turmeric.
(b) The yellow stain of curry turns reddish-brown when soap is scrubbed on it because of the fact that soap solution is basic in nature which changes the colour of turmeric in the curry stain to reddish-brown. This stain turns yellow again when the cloth is rinsed with water because then the basic soap gets removed with water.
(c) The nature of soap is basic
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