Question

Which of the following n-factor is correct :-

• A. FeC$_2$O$_4$ + MnO$_4$⁻ → Fe$^{+3}$ + CO$_2$ + Mn$^{2+}$ n$_f$ = 2
• B. Cu$_2$S → CuO + SO$_2$ n$_f$ = 6
• C. KCIO$_3$ → KCI + O$_2$ n$_f$ = 6
• D. C$_2$O_4$$^{2-} → CO$_2$ n$_f$ = 1

Answer 1

Answer: (C)

C. KCIO$_3$ → KCI + O$_2$ n$_f$ = 6

Answer 2

The n-factor is the number of moles of electrons transferred per mole of substance. A. FeC$_2$O$_4$: Fe changes from +2 to +3 (change = 1), C changes from +3 to +4 (change = 2). Total n-factor = 1 + 2 = 3. B. Cu$_2$S: Cu changes from +1 to +2 (change = 2), S changes from -2 to +4 (change = 6). Total n-factor = 2 + 6 = 8. C. KClO$_3$: Cl changes from +5 to -1 (change = 6). O changes from -2 to 0 (change = 6). The n-factor is 6. D. C$_2$O_4$$^{2-}: C changes from +3 to +4 (change = 2). The n-factor is 2. Only option C is correct.