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Q.

At 25oC pH range of phenolphthalein is 8 - 10. At 100oC pH range of phenolphthalein would be

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a

pH range is altered to 7 to 11

b

pH range remains unaffected by the temperature

c

pH range is altered to 8 to 11

d

pH range is altered to 8 to 9

answer is B.

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Detailed Solution

The pH range of the indicator is pKin + 1. On increase in temperature,  pKin  decreases therefore pH range of indicator decreases.

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