For M2-M and M3-M2- systems- E0 values for some metals are as follows-Cr2-aq- 2e- - Crs- E0- -0-91 V Cr3-aq-e- - Cr2-aq- E0 - - 0-41 VMn2-aq- 2e- - Mns- E0- -1-2 V Mn 3-aq- e- - Mn2-aq- E0-1-51 VFe2-aq- 2e- - Fes- E0- -0-44 V Fe 3-aq- e- - Fe2-aq- E0-0-77 VWhich of the following statements is-are correct regarding the given standard reduction potentials-

Mn^2+/Mn couple has the least E^0 value than redox couples. nbsp; nbsp; Thus, Mn will readily go oxidation than others and hence, it is the powerful reducin ...

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Byju's Answer

Standard XII

Chemistry

Reactivity Trends (Group 2)

For M2+/M and...

Question

For $M^{2 +} / M and M^{3 +} / M^{2 +}$ systems, $E^{0}$ 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?

M n

is the powerful reducing agent

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M n

is more vulnerable to oxidation than

C r

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F e^{3 +}

has more oxidising power than

F e^{2 +}

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All of the above.

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Solution

The correct option is D All of the above.
$M n^{2 +} / M n$ couple has the least $E^{0}$ value than redox couples.
Thus, $M n$ will readily go oxidation than others and hence, it is the powerful reducing agent.

$F e^{3 +} / F e^{2 +}$ has higher $E^{0}$ value than $F e^{2 +} / F e$ couple. Thus, $F e^{3 +}$ will have more tendency to reduce to $F e^{2 +}$ than $F e^{2 +}$ to $F e$
Hence, $F e^{3 +}$ will have more oxidising power than $F e^{2 +}$ .

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Similar questions

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?

Q. Choose the correct option(s) for the given half cell reactions:

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

Q. Choose the correct statement among the following for the given half cell reaction:

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

Q. Which of the following of metals, when coupled, will give maximum EMF for a voltaic cell?
Given:

A u^{+} (a q) + e^{-} \to A u (s); E^{0} = 1.69 V

C u^{2 +} (a q) + 2 e^{-} \to C u (s); E^{0} = 0.34 V

P b^{2 +} (a q) + 2 e^{-} \to P b (s); E^{0} = - 0.13 V

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

C a^{2 +} (a q) + 2 e^{-} \to C a (s); E^{0} = - 2.87 V

Q. Which of the following statement(s) is/are true for the following half cell reactions?

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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