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Q.

The indicator used in the titration of a strong acid and a strong base is 

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a

alizarin yellow

b

phenolphthalein 

c

red litmus 

d

methyl orange 

answer is A.

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Detailed Solution

Using a phenolphthalein indicator, a strong acid- strong base titration is performed. Phenolphthalein is selected because it changes colour between 8.3-10 in a pH range. In basic solutions, it will appear pink, and clear in acidic solutions.

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