The standard reduction potential at 298 K for the following half cell reactions are given below: Zn 2+(a q)+2 e- longrightarrow Zn (s) ; E°=-0.762 V Cr 3+(a q)+3 e- longrightarrow Cr (s) ; E°=-0.740 V 2 H +(a q)+2 e- longrightarrow H 2(g) ; E°=0.0 V Fe 3+(a q)+e- longrightarrow Fe 2+(a q) ; E°=0.77 V Which is the strongest reducing agent?

Question

The standard reduction potential at 298 K for the following half cell reactions are given below: Zn 2+(a q)+2 e- longrightarrow Zn (s) ; E°=-0.762 V Cr 3+(a q)+3 e- longrightarrow Cr (s) ; E°=-0.740 V 2 H +(a q)+2 e- longrightarrow H 2(g) ; E°=0.0 V Fe 3+(a q)+e- longrightarrow Fe 2+(a q) ; E°=0.77 V Which is the strongest reducing agent? (A) Zn (s) (B) Cr (s) (C) H 2(g) (D) Fe 2+ (aq)

Tardigrade Admin · Accepted Answer

Zn has lowest reduction potential value and it will be easily oxidised. Therefore, it acts as strongest reducing agent.

$Z n_{(s)}$

$C r_{(s)}$

$H_{2 (g)}$

$F e_{(a q)}^{2 +}$

$Z n$ has lowest reduction potential value and it will be easily oxidised. Therefore, it acts as strongest reducing agent.

Q. The standard reduction potential at 298K for the following half cell reactions are given below : Zn2+(aq)+2e−⟶Zn(s)​;E∘=−0.762V Cr3+(aq)+3e−⟶Cr(s)​;E∘=−0.740V 2H+(aq)+2e−⟶H2(g)​;E∘=0.0V Fe3+(aq)+e−⟶Fe2+(aq);E∘=0.77V Which is the strongest reducing agent?

Zn(s)​

Cr(s)​

H2(g)​