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Standard X

Chemistry

Oxidation and Reduction

If a small Cu...

Question

If a small Cu rod is placed in an aqueous solution of ferrous salt , then which of the following will be observed? ( E ^0 _{cu^{2+}/cu}= 0.34V ; {E^0}_{Fe^{2+}/Fe}= -0.44V ) (1) Copper will be oxidised (2) Fe^{2+} will be reduced (3) No reaction will take place (4) Fe^{2+ }will be oxidised

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$E_{F e^{2 +} / F e}^{\circ} = - 0.44 V, E_{C u^{2 +} / C u}^{\circ} = 0.34 V, E_{A g^{2 +} / g}^{\circ} = 0.80 V$ . 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

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

The

E^{\circ}

F e + C u^{2 +} ⇋ F e^{2} + C u

is _______ and thus, reaction is spontaneous/nonspontaneous.

Given: $F e_{(s)} \to F e^{2 +} + 2 e^{-}; E^{o} = + 0.44 V$

$P b_{(s)} \to P b^{2 +} + 2 e^{-}; E^{o} = + 0.13 V$

$A g^{+} e^{-} \to A g; E^{o} = + 0.8 V$

$C u^{2 +} 2 e^{-} \to C u; E^{o} = + 0.34 V$

Which of the following metals will oxidise iron?

a) $A g$

b) $C u$

c) $P b$

d) None of these

Q. Will

F e

be oxidised to

F e^{2 +}

by reaction with

1.0 M H C l

E^{\circ}

for

F e / F e^{2 +} = + 0.44 v o l t

Q. Will

F e_{(s)}

be oxidised to

F e^{2 +}

by the reaction with

1 M H C l

? (

E^{\circ}

for

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

)

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