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The most suitable indicator for the titration of HCOOH against NaOH is
A. methyl orange
B. phenolphthalein
C. thymol phthalein
D. Both (b) and (C)

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HCOOH is a weak acid and NaOH is a strong base, therefore, both, phenolphathalein and thymol phthalein can be used as indicator.

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