Using the standard potential values given below- decide which of the statements I- II- III- IV are correct- Choose the right answer from a- b- c and d-Fe2-2e- Fe- E-0-44 VCu2-2e- - Cu- E-0-34 V Ag-e- - Ag- E-0-80 VI- Copper can displace iron from FeSO4 solution-II- Iron can displace copper from CuSO4 solution-III- Silver can displace Cu from CuSO4 solution-IV- Iron can displace silver from AgNO3 solution-

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Electrochemical Series

Using the sta...

Question

Using the standard potential values given below, decide which of the statements I, II, III, IV are correct. Choose the right answer from (a), (b), (c) and (d).
$F e^{2 +} + 2 e^{-} \to F e, E^{\circ} = - 0.44 V$
$C u^{2 +} + 2 e^{-} \to C u, E^{\circ} = + 0.34 V$
$A g^{+} + e^{-} \to A g, E^{\circ} = + 0.80 V$
I. Copper can displace iron from $F e S O_{4}$ solution.
II. Iron can displace copper from $C u S O_{4}$ solution.
III. Silver can displace Cu from $C u S O_{4}$ solution.
IV. Iron can displace silver from $A g N O_{3}$ solution.

I and II

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II and III

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II and IV

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I and IV

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Solution

The correct option is C II and IV
Metal ions having lower standard reduction potential can displace metal ions having higher standard reduction potential.
$F e^{2 +} + 2 e^{-} \to F e, E^{\circ} = - 0.44 V$
$C u^{2 +} + 2 e^{-} \to C u, E^{\circ} = + 0.34 V$
$A g^{+} + e^{-} \to A g, E^{\circ} = + 0.80 V$
$C u^{2 +}$ has more standard reduction potential than $F e^{2 +}$ ion. So, copper can not displace iron from $F e S O_{4}$ solution.
$F e^{2 +}$ has less standard reduction potential than $C u^{2 +}$ ion. So, iron can displace copper from $C u S O_{4}$ solution.
$A g^{+}$ has more standard reduction potential than $C u^{2 +}$ ion. So, silver can not displace copper from $C u S O_{4}$ solution.
$F e^{2 +}$ has less standard reduction potential than $A g^{+}$ ion. So, iron can displace silver from $A g N O_{3}$ solution.

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Similar questions

Q. Using the standard potential values given below, decide which of the statements I, II, III, IV are correct. Choose the right answer from (a), (b), (c) and (d).

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

C u^{2 +} + 2 e^{-} \to C u, E^{\circ} = + 0.34 V

A g^{+} + e^{-} \to A g, E^{\circ} = + 0.80 V

I. Copper can displace iron from

F e S O_{4}

solution.
II. Iron can displace copper from

C u S O_{4}

solution.
III. Silver can displace Cu from

C u S O_{4}

solution.
IV. Iron can displace silver from

A g N O_{3}

solution.

$E_{F e^{2 +} / F e}^{\circ} = - 0.44 V, E_{C u^{2 +} / C u}^{\circ} = 0.34 V, E_{A g^{2 +} / g}^{\circ} = 0.80 V$ . Will Fe displace Cu from $C u S O_{4}$ solution? Will Ag displace Cu from $C u S O_{4}$ solution?

1. Yes, Yes

2. No, No

3. Yes, No

4. No, Yes

Can copper displace iron from $F e S O_{4}$ .

Q. Consider the following standard oxidation potentials

(at 25^{\circ} C)

E_{A g | A g^{+}}^{\circ} : - 0.799 V; E_{H g | H g^{2 +}}^{\circ} : - 0.789 V; E_{M g | M g^{2 +}}^{\circ} : + 2.37 V;

E_{M n | M n^{2 +}}^{\circ} : + 1.18 V; E_{S n | S n^{2 +}}^{\circ} : 0.136 V

.
Which of the following statement(s) is/are incorrect under standard conditions?

Given;

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

E_{A g^{\oplus} | A g}^{⊖} = 0.80 V

Assertion: Copper sulphate solution can be stored in silver vessel.

Reason:

E_{c e l l}^{⊖}

is positive.

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