E - value of Mg 2- Mg - Zn 2- Z n and F e 2- F e are -2-37 V -0-76 V and 0-44 V respectively- Which of the following is correct-A- Mg 2- Oxidises F e to F e 2-B- Zn Oxidises F e 2- to FeC- Zn reduces Mg 2- to MgD- Zn reduces F e 2- to Fe

The correct option is D Zn reduces Fe^2+ to Fe Reduction potential values : iron ions gt; zinc ions gt; magnesium ions. The idea is that both the reactio ...

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Byju's Answer

Standard XII

Chemistry

Redox Reactions and Couple

E ∘ value of ...

Question

$E^{\circ}$ value of $M g^{2 +} | M g, Z n^{2 +} | Z n$ and $F e^{2 +} | F e$ are – 2.37 V, - 0.76 V and 0.44 V respectively. Which of the following is correct?

$M g^{2 +}$ Oxidises $F e$ to $F e^{2 +}$

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Zn Oxidises $F e^{2 +}$ to $F e$

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Zn reduces $M g^{2 +}$ to $M g$

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Zn reduces $F e^{2 +}$ to $F e$

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Solution

The correct option is D
Zn reduces $F e^{2 +}$ to $F e$

Reduction potential values : iron ions > zinc ions > magnesium ions.

The idea is that both the reactions must form a postive cell potential value. For this, the species getting reduced is at the cathode and the other one at the anode. The anode is where oxidation happens, so the sign needs to be reversed as we have reduction potential values here.

This means that iron ions are most likely to get reduced in this setup due to their positive value. Zinc and magesium metals can reduce iron ions. Option D fits.

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Similar questions

Q. SRP values of

M g^{2 +} | M g

F e^{2 +} | F e

and

Z n^{2 +} | Z n

are

- 2.37 V, - 0.44 V

and

- 0.76 V

respectively. The correct statement is:

E^{o}

for

M g^{2 +} / M g = - 2.37 V, Z n^{2 +} / Z n = - 0.76 V

and

F e^{2 +} / F e = - 0.44 V

Which of the following statement is correct?

E^{⊖} o f M g^{2 +} | M g, Z n^{2 +} | Z n,

and

F e^{2 +} | F e

are

- 2.37 V

- 0.76 V

, and -

0.44 V

, respectively. Which of the following is correct ?

Q. Standard reduction potential values for the electrodes are given below

M g^{2 +} + 2 e^{-} \to M g; E^{0} = - 2.37 V

Z n^{2 +} + 2 e^{-} \to Z n; E^{0} = - 0.76 V

F e^{2 +} + 2 e^{-} \to F e; E^{0} = - 0.44 V

Which of the following statements is correct?

Q. The standard electrode potential of the half cells is given below:

Z n^{2 +} + 2 e^{-} \to Z n; E = - 0.76 V

F e^{2 +} + 2 e^{-} \to F e; E = - 0.44 V

The emf of the cell

F e^{2 +} = Z n^{-} \to Z n^{2 +} + F e

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E∘ value of Mg2+|Mg,Zn2+|Zn and Fe2+|Fe are – 2.37 V, - 0.76 V and 0.44 V respectively. Which of the following is correct?

$E^{\circ}$ value of $M g^{2 +} | M g, Z n^{2 +} | Z n$ and $F e^{2 +} | F e$ are – 2.37 V, - 0.76 V and 0.44 V respectively. Which of the following is correct?