For the following half cell reactions, E° values are also given Mn2++2H2O xrightarrow[]MnO2+4H++2e-; E° =-1.23V MnO4-+4H++3e- xrightarrow[]MnO2+2H2O; E° =+1.70V Select correct statements

Question

For the following half cell reactions, E° values are also given Mn2++2H2O xrightarrow[]MnO2+4H++2e-; E° =-1.23V MnO4-+4H++3e- xrightarrow[]MnO2+2H2O; E° =+1.70V Select correct statements (A)  Mn2+ reacts with MnO4- in acid solution to form MnO2  (B)  Mn(MnO4)2 is stable in acid solution (C)  MnO2 disproporttbnates to Mn2+ and MnO4- in acid solution (D) None of the above

Tardigrade Admin · Accepted Answer

2MnO4-+3Mn2++2H2O xrightarrow[]5MnO2+4H+; E° =0.47 V Thus, cell reaction in which Mn2+ on reaction with MnO4- forms MnO2 in acidic medium.

Q. For the following half cell reactions, $E^{\circ}$ values are also given $M n^{2 +} + 2 H_{2} O M n O_{2} + 4 H^{+} + 2 e^{-};$ $E^{\circ} = - 1.23 V$ $M n O_{4}^{-} + 4 H^{+} + 3 e^{-} M n O_{2} + 2 H_{2} O;$ $E^{\circ} = + 1.70 V$ Select correct statements

$M n^{2 +}$ reacts with $M n O_{4}^{-}$ in acid solution to form $M n O_{2}$

$M n (M n O_{4})_{2}$ is stable in acid solution

$M n O_{2}$ disproporttbnates to $M n^{2 +}$ and $M n O_{4}^{-}$ in acid solution

None of the above

$2 M n O_{4}^{-} + 3 M n^{2 +} + 2 H_{2} O 5 M n O_{2} + 4 H^{+};$
$E^{\circ} = 0.47 V$
Thus, cell reaction in which
$M n^{2 +}$ on reaction with $M n O_{4}^{-}$ forms $M n O_{2}$ in acidic medium.

Q. For the following half cell reactions, E∘ values are also given Mn2++2H2​O​MnO2​+4H++2e−; E∘=−1.23V MnO4−​+4H++3e−​MnO2​+2H2​O; E∘=+1.70V Select correct statements

Mn2+ reacts with MnO4−​ in acid solution to form MnO2​

Mn(MnO4​)2​ is stable in acid solution

MnO2​ disproporttbnates to Mn2+ and MnO4−​ in acid solution