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Question

Choose the correct statement regarding Phenolphthalein indicator:

A
Colour transition range is nearly (8.310)
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B
Colour transition range is nearly (3.24.4)
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C
Colour transition range is nearly (56.7)
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D
Colour transition range is nearly (12.214)
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Solution

The correct option is A Colour transition range is nearly (8.310)
Colour transition range (CTR):
It is the pH range between which the indicator changes its colour.

Indicator CTRMethyl Orange 3.24.4Phenolphthalein 8.310Phenol Red 6.48.2Bromothymol 6.27.4

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