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Wurtz Halide Reaction

The standard ...

Question

The standard redox potentials $E^{0}$ of the following system are
$I . M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O E^{0} = 1.5 V$
$I I . S n^{2 +} \to S n^{4 +} + 2 e^{-} E^{0} = - 0.15 V$
$I I I . C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{2 +} + 7 H_{2} O E^{0} = 1.33 V$
$I V . C e^{3 +} \to C e^{4 +} + e^{-} E^{0} = - 1.61 V$
The oxidizing power of the various species are related as

A

C r_{2} O^{2 -} 7 > M n O_{4}^{-}

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B

C e^{4 +} > S n^{4 +}

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C

C e^{4 +} > M n O_{4}^{-}

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D

M n O_{4}^{-} > S n^{4 +}

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Solution

The correct option is D $M n O_{4}^{-} > S n^{4 +}$
Electrode with highest +SRP will be strongest oxidant

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Q. The standard redox potentials

E^{0}

of the following system are

I . M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O E^{0} = 1.5 V

I I . S n^{2 +} \to S n^{4 +} + 2 e^{-} E^{0} = - 0.15 V

I I I . C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{2 +} + 7 H_{2} O E^{0} = 1.33 V

I V . C e^{3 +} \to C e^{4 +} + e^{-} E^{0} = - 1.61 V

The oxidizing power of the various species are related as

Q. The standard redox potentials E

^{o}

of the following systems are:

	System	E $^{o}$ (volts)
(i)	$M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O$	1.51
(ii)	$S n^{2 +} \to S n^{4 +} + 2 e^{-}$	0.15
(iii)	$C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O$	1.33
(iv)	$C e^{3 +} \to C e^{4 +} + e^{-}$	1.61

The oxidising power of the various species are related as:

Q. The standard reduction potentials

E^{0}

of the following systems are

	System	$E^{0}$ volts
(i)	$M n O_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ M n^{2 +} + 4 H_{2} 0$	1.51
(ii)	$S n^{4 +} + 2 e^{-} ⟶ S n^{2 +}$	0.15
(iii)	$C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} ⟶ 2 C r^{3 +} + 7 H_{2} O$	1.33
(iv)	$C e^{4 +} + e^{-} ⟶ C e^{3 +}$	1.61

The oxidising power of the various species decreases in the order

Q. The values of

E^{0}

of some of the reactions are given below:

I_{2} (g) + 2 e^{-} \to 2 I^{-} (a q); E^{0} = + 0.54 V

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

F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = + 0.76 V

C e^{4 +} (a q) + e^{-} \to C e^{3 +} (a q); E^{0} = + 1.60 V

S n^{4 +} (a q) + 2 e^{-} \to S n^{2 +} (a q); E^{0} = + 0.15 V

Which of the following statement is/are true?

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

E^{0}

values for some metals are as follows:

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

Which of the following statement(s) is/are correct regarding the given standard reduction potentials?

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