Teaching DSSSB PGT Mock Test 2025 Chemistry Redox Reactions

The role of H3PO4 in the estimation of Fe(II) with K2Cr2O7 using diphenylamine sulphonate as indicator is to

1
avoid aerial oxidation of Fe(II)
2
reduce the electrode potential of Fe3+ → Fe2+
3
stabilize the indicator
4
stabilize K2Cr2O7
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