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Question

The standard reduction potentials at 298 K for the following half-cell reactions are given:
Zn2+(aq)+2eZn(s); 0.762 V
Cr3+(aq)+3eCr(s); 0.74 V
2H+(aq)+2eH2(g); +0.00 V
Fe3+(aq)+eFe2+(aq); +0.77 V
Which one of the following is the strongest reducing agent?

  1. Zn(s)
  2. Cr(s)
  3. H2(s)
  4. Fe2+(aq)

A
Zn(s)
B
Cr(s)
C
Fe2+(aq)
D
H2(s)
Solution
Verified by Toppr

The electrode having higher oxidation potential will be stronger reducing agent than electrode having a lower oxidation potential. Hence electrode having higher oxidation potential always undergoes oxidation during the reaction.

The electrode having lowest reduction potential will be the strongest reducing agent than electrode having lower reduction potential. Hence electrode having higher reduction potential always undergoes reduction during the reaction.

So from the given options the reaction:

Zn2+(aq)+2eZn(s);0.762

Zn(s) is the strongest reducing agent.

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Similar Questions
Q1
The standard reduction potentials at 298 K for the following half-cell reactions are given:
Zn2+(aq)+2eZn(s); 0.762 V
Cr3+(aq)+3eCr(s); 0.74 V
2H+(aq)+2eH2(g); +0.00 V
Fe3+(aq)+eFe2+(aq); +0.77 V
Which one of the following is the strongest reducing agent?

View Solution
Q2
The standard reduction potentials at 298 K for the following half reactions are given against each:

Zn2+(aq)+2eZn(s);0.762 V
Cr3+(aq)+3eCr(s);0.740 V
2H+(aq)+2eH2(g);0.00 V
Fe3+(aq)+eFe2+(aq);0.770 V

Which is the strongest reducing agent?

View Solution
Q3
The standard reduction potentials at 298K for the following half cell reaction are given below:

Zn2+(aq)+2eZn(s);Eo=0.762V
Cr3+(aq)+3eCr(s);Eo=+0.762V
2H+(aq)+2eH2(g);Eo=+0.00V
Fe3+(aq)+eFe2+(aq);Eo=+0.770V

Based on the above reactions, select the strongest reducing agent?

View Solution
Q4
The standard reduction potential at 298 K for following half reactions are given against each
Zn2+(aq)+2eZn(s);0.762
Cr3+(aq)+3eCr(s);0.740
2H(aq)+2eH2(g);0.000
Fe3+(aq)+3eFe2+(aq);0.770
Which is the strongest reducing agent ?
View Solution
Q5
The standard reduction potentials at 298K for the following half-cell reactions are given by
Zn2+(aq)+2eZn(s)0.762
Cr3+(aq)+3eCr(s)0.74
2H+(aq)+2eH2(g)+0.00
Fe3+(aq)+eFe2+(aq)+0.77
Which one of the following is the strongest reducing agent?
View Solution