Chemistry - Redox Reactions Question with Solution | TestHub

1 mol of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7=6$ equivalents.

${\mathrm{FeSO}}_4$: n-factor 1, so 6 mol: (A) true.

${\mathrm{FeC}}_2{\mathrm{O}}_4$: n-factor 3, so $6/3=2$ mol, not 3: (B) false.

${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ to ${\mathrm{SO}}_4^{2-}$: each S goes from +2 to +6, two S give 8 $e^{-}$, n-factor 8, so $6/8=0.75$ mol: (C) true.

${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4$: n-factor 2, so 3 mol: (D) true.

Answer: A, C, D.