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
makes stain on white shirt (we
don’t know the color yet).
Based on the options, it might be turmeric
the stain becomes
This is because Turmeric is an acid-base indicator , and when it reacts with base, it becomes red
with water, the
, and washes off. Thus, the turmeric becomes its original yellow color.
From our options
- (ii) Soap is basic in nature - is correct
- (iii) Turmeric is a natural indicator which gives reddish tinge in bases - is correct
So, the correct answer is (b) - (ii) and (iii)