A suitable indicator for the titration of Fe^2+ against K2Cr2O7 in acidic medium is:

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A suitable indicator for the titration of $Fe X^{2 +}$ against $K X_{2} Cr X_{2} O X_{7}$ in acidic medium is:

Aphenolphthalein
Bstarch
Cdiphenylamine
Dmethyl orange

Answer: C

Dichromate (orange) changes to

Cr X^{3 +}

(green), which masks any colour change, so a redox indicator such as diphenylamine is used. Phenolphthalein and methyl orange are acid-base indicators, and starch is used for iodine.

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A suitable indicator for the titration of $Fe X^{2 +}$ against $K X_{2} Cr X_{2} O X_{7}$ in acidic medium is: