将电对 MnO 4 - / Mn 2+ 与 Fe 3+ / Fe 2+ 组成原电池,其电池组成式正确的是 ( ) 。
A.
( - ) Pt ∣ Fe 3+ (c 1 ) ∣ Fe 2+ (c 2 )‖Mn 2+ (c 3 ) ∣ MnO 4 - (c 4 ) ∣ Pt ( + )
B.
( - ) Pt ∣ Fe 3+ (c 1 ) , Fe 2+( c 2 )‖Mn 2+ (c 3 ) , MnO 4 - (c 4 ) , H + (c 5) ∣ Pt ( + )
C.
( + ) Pt ∣ Mn 2+ (c 1 ) ∣ MnO 4 - (c 2 )‖Fe 3+ (c 3 ) ∣ Fe 2+ (c 4 ) ∣ Pt ( - )
D.
( + ) Pt ∣ Mn 2+ (c 1 ) , MnO 4 - (c 2 ) , H + (c 3 )‖Fe 3+ (c 4 ) , Fe 2+ (c 5 ) ∣ Pt ( - )