Question

Which species is the strongest oxidizing agent under standard conditions? Half-reaction Eo (V) MnO2(s) + 4H+ (aq) + 2e– → Mn2+(aq) + 2H2O(l) 1.22 V SnO2(s) + 2H2O() + 4e– → Sn(s) + 4OH– (aq) -0.95 V Hg2SO4(s) + 2e– → 2Hg(l) + SO42 – (aq) +0.61 V Cr(OH)3(s) + 3e– → Cr(s) + 3OH– (aq) –1.48 V Mn2 2+ + 2e- ⇌ Mn2 -1.18 A. MnO2 B. Sn C. Hg2SO4 D. Cr E. Mn2 2+

Answer 1

Half-reaction Eo (V)

MnO2(s) + 4H+ (aq) + 2e– → Mn2+(aq) + 2H2O(l)    E0 = 1.22 V

SnO2(s) + 2H2O() + 4e– → Sn(s) + 4OH– (aq)     E0 = -0.95 V

Hg2SO4(s) + 2e– → 2Hg(l) + SO42 – (aq)           E0 = +0.61 V

Cr(OH)3(s) + 3e– → Cr(s) + 3OH– (aq)               E0 = –1.48 V

Mn2 2+ + 2e- ⇌ Mn2    E0 = -1.18 v

Standard reduction potential value more positive ion or molecule is strong oxidizing agent.

MnO2(s) + 4H+ (aq) + 2e– → Mn2+(aq) + 2H2O(l)    E0 = 1.22 V

MnO2 has strong oxidizing agent.

A. MnO2       >>>>>>.answer