Q 2683212147.     The indicator constant of phenolphthalein is approximately `10^-10`. A solution is prepared by adding 100.01 c. c. of 0.01 N sodium hydroxide to 100.00 c. c. of 0.01 N hydrochloric acid. If a few drops of phenolphthalein are now added, what fraction of the indicator is converted to its coloured form?

A

`2/3`

B

`3/4`

C

`1/2`

D

`9/11`

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