Chemistry
Grade-10
Easy
Question
Shreya took some turmeric powder and made a paste by adding some water. She cut the strips of paper and applied this turmeric paste on them. After drying this strip, she put a few drops of some sample solution on each.
What would be the change in color of strips, she observed?
(i) Salt solution
(ii) Orange juice
(iii) Liquid detergent
(iv) Watermelon juice
(i)
(ii)
(iii)
(iv)
Red
Yellow
Yellow
Red
(i)
(ii)
(iii)
(iv)
Yellow
Yellow
Red
Red
(i)
(ii)
(iii)
(iv)
Red
Yellow
Red
Yellow
(i)
(ii)
(iii)
(iv)
Yellow
Red
Yellow
Red
| (i) | (ii) | (iii) | (iv) |
| Red | Yellow | Yellow | Red |
|
(i) |
(ii) |
(iii) |
(iv) |
|
Yellow |
Yellow |
Red |
Red |
| (i) | (ii) | (iii) | (iv) |
| Red | Yellow | Red | Yellow |
| (i) | (ii) | (iii) | (iv) |
| Yellow | Red | Yellow | Red |
Hint:
Turmeric only changes color in the presence of a base, and not in the presence of an acid.
The correct answer is:
(i)
(ii)
(iii)
(iv)
Yellow
Yellow
Red
Red
(i)
(ii)
(iii)
(iv)
Yellow
Yellow
Red
Red
Turmeric paste can be used as an acid-base indicator. Turmeric only changes color in the presence of a base, and not in the presence of an acid.
(i) Salt solution- Yellow
(ii) Orange juice- Yellow
(iii) Liquid detergent- Red
(iv) Watermelon juice- Red
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