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Electrochemical Series

Which metal i...

Question

Which metal is considered best for protecting the other metal?
$E {^{0}}_{F e^{2 +} / F e} = - 0.44 V, E {^{0}}_{Z n^{2 +} / Z n} = - 0.76 V$
$E {^{0}}_{M g^{2 +} / M g} = - 2.37 V, E {^{0}}_{C u^{2 +} / C u} = - 0.34 V$

A

F e

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B

A g

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C

M g

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D

Z n

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Solution

The correct option is C $M g$
Among the given metals, the standard reduction potential of magnesium is most negative. This means that magnesium is most easily oxidized. Hence it is best for protecting other metal.

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Q. SRP values of

M g^{2 +} | M g

F e^{2 +} | F e

Z n^{2 +} | Z n

- 2.37 V, - 0.44 V

- 0.76 V

respectively. The correct statement is:

E^{o}

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

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,

F e^{2 +} | F e

- 2.37 V

- 0.76 V

0.44 V

, respectively. Which of the following is correct ?

Z n (s) / Z n^{2 +} (a q) ∥ C u^{2 +} (a q) / C u (s)

{E^{0}}_{{Z n}^{2 +} / Z n} =

-

{E^{0}}_{{C u}^{2 +} / C u} =

+

{E^{0}}_{c e l l}

and equilibrium constant

K

.

E^{\circ}

values of following reactions:

C u_{(s)} + Z n_{(a q)}^{2 +} \to Z n_{(s)} + C u_{(a q)}^{2 +}

E_{C u^{2 +} / C u}^{0} = 0.34 V, E_{Z n^{2 +} / Z n}^{0} = - 0.76 V

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