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प्रश्न
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ______.
विकल्प
red and blue.
blue and red.
pink and colourless.
colourless and pink.
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उत्तर
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are colourless and pink.
Explanation:
Phenolphthalein remains colourless in acidic solution and turns pink in basic solution.
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