Vinay observed that the stain of curry on a white shirt becomes reddish-brown when
soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation?
i. Soap is acidic in nature
ii. Soap is basic in nature
iii. Turmeric is a natural indicator which gives reddish tinge in bases
iv. Turmeric is a natural indicator which gives reddish tinge in acids
A. i and ii
B. ii and iii
C. i and iv
D. ii and iv
soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation?
i. Soap is acidic in nature
ii. Soap is basic in nature
iii. Turmeric is a natural indicator which gives reddish tinge in bases
iv. Turmeric is a natural indicator which gives reddish tinge in acids
A. i and ii
B. ii and iii
C. i and iv
D. ii and iv
Answers & Comments
b is the right answer
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Verified answer
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The reason for Vinay's observation can be explained as follows:
i. Soap is basic in nature: Soap is typically basic (alkaline) in nature. When soap is scrubbed on the curry stain, it can neutralize the acidic components in the stain, causing it to change color from reddish-brown to yellow.
iv. Turmeric is a natural indicator which gives reddish tinge in acids: Turmeric is a natural indicator that turns reddish-brown in the presence of acids. Since curry often contains acidic components (such as certain spices and ingredients like tomatoes), when soap neutralizes the acids in the curry stain, it can lead to a change in the color of the turmeric in the stain, making it reddish-brown.
So, the correct combination of statements that explains Vinay's observation is:
C. i and iv
Soap's basic nature helps neutralize the acidic components in the curry stain, and turmeric acts as a natural indicator that turns reddish-brown in the presence of acids.