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Which of the ...

Question

Which of the following statement(s) is/are correct regarding the given electrode potential data?
$F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = + 0.77 V$
$A l^{3 +} (a q) + 3 e^{-} \to A l (s); E^{0} = - 1.66 V$
$B r_{2} (g) + 2 e^{-} \to 2 B r^{-} (a q); E^{0} = + 1.08 V$

F e^{2 +}

is stronger reducing agent than

B r^{-}

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F e^{2 +}

is stronger reducing agent than

A l

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A l

is stronger reducing agent than

F e^{2 +}

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B r^{-}

is stronger reducing agent than

A l

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Solution

The correct option is C $A l$ is stronger reducing agent than $F e^{2 +}$
Standard reduction potentials (SRP) of the half cell electrodes are calculated and arranged in a series of increasing order which is known as electrochemical series.
The standard electrode potential of $H^{+} / H_{2}$ couple is zero.

Here, a negative $E^{0}$ signifies that it has high tendency to get oxidised and the redox couple is a stronger reducing agent than the $H^{+} / H_{2}$ couple.

A positive $E^{0}$ signifies that it has high tendency to get reduced and the redox couple is a stronger oxidising agent than the $H^{+} / H_{2}$ couple.

Going down the electrochemical series, the $E^{0}$ value decrease i.e., the strength of oxidising agent gets reduced.

From the given potential data,
$B r_{2} / B r^{-}$ couple has the highest $E^{0}$ value so it is the strongest oxidising agent than $F e^{3 +}$ and $A l^{3 +}$

$F e^{3 +} / F e^{2 +}$ couple has lower $E^{0}$ value than $B r_{2} / B r^{-}$ couple so $F e^{2 +}$ is a stronger reducing agent than $B r^{-}$

$F e^{3 +} / F e^{2 +}$ couple has higher $E^{0}$ value than $A l^{3 +} / A l$ couple so $F e^{3 +}$ is stronger oxidising agent than $A l^{3 +}$ and $A l$ is the stronger reducing agent than $F e^{2 +}$

Thus, statement (a) and (c) are correct.

Suggest Corrections

Similar questions

F e_{(a q)}^{3 +} + e^{-} \to F e_{(a q)}^{2 +}

E^{o} = + 0.77

A l_{(a q)}^{3 +} + 3 e^{-} \to A l_{s}; E^{o} = - 1.66

B r_{2 (a q)} + 2 e^{-} \to 2 B r_{(a q)}^{-}; E^{o} = + 1.66

M^{2 +} / M and M^{3 +} / M^{2 +}

E^{0}

C r^{2 +} (a q) + 2 e^{-} \to C r (s); E^{0} = - 0.91 V C r^{3 +} (a q) + e^{-} \to C r^{2 +} (a q); E^{0} = - 0.41 V

M n^{2 +} (a q) + 2 e^{-} \to M n (s); E^{0} = - 1.2 V M n^{3 +} (a q) + e^{-} \to M n^{2 +} (a q); E^{0} = + 1.51 V

F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = + 0.77 V

E^{0}

F e^{3 +} (a q) + 3 e^{-} \to F e (s)

E^{0}

F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = 0.77 V

F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V

F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{0} = 2.87 V C l_{2} (g) + 2 e^{-} \to C l^{-} (a q); E^{0} = 1.36 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = 0.77 V

F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{0} = 2.87 V C l_{2} (g) + 2 e^{-} \to C l^{-} (a q); E^{0} = 1.36 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = 0.77 V

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