Discussion
Following table depicts colour changes in acids and bases when various indicators are added :
| Indicator | Colour change in acids | Colour change in bases |
|---|---|---|
| Turmeric | No change | A |
| China rose | Dark Pink | B |
| Phenolphthalein | C | Pink |
| Methyl orange | D | Pink |
A, B, C, D respectively are :
Answer: A
The answer is reddish brown, green, colourless, orange.
The first three entries settle it. Turmeric is yellow and turns reddish brown in a base (A). China rose turns dark pink (magenta) in an acid and green in a base (B). Phenolphthalein is colourless in an acid and pink in a base (C). Only the first option has all three.
The table's methyl orange row is not accurate as printed: methyl orange is red in acid and yellow in base. But no other option fits A, B and C, so the first option is the answer. The others give turmeric as yellow in base or phenolphthalein as orange or pink in acid, which are wrong.
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