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During the titration of a mixture of Na(...

During the titration of a mixture of `Na_(2)CO_(3)` and `NaHCO_(3)` against HCl :

A

Phenolphthalein is used to detect the first end point

B

Phenolphthalein is used to detect the second end point

C

Methyl orange is used to detect the first end point

D

Phenolphthalein is used to detect the first and second end point

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The correct Answer is:
A
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