Question

4. Why does the stain of curry on a white cloth becomes reddish brown when soap is rubbed on it and
turns yellow when cloth is washed in water?
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Answer 1

Answer:

because curry has turmeric powder and soap is basic in nature

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 red-brown. This stain turns yellow again when the cloth is rinsed with water because then the basic soap gets removed with water.

Answer 2

Answer:

this is due to the fact that soap solution is basic in nature which changes the colour of turmeric in the curry stain to red brown. this stain turns to yellow again when the clothe is rinised with plenty of water. this is because then the basic soap rinsed with water.