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Electrolysis and Electrolytes

Adding powder...

Question

Adding powdered Pb and Fe to a solution containing 1 M in each of $P b^{2 +}$ and $F e^{2 +}$ ions would result into the formation of :

A

more of

P b

and

F e^{2 +}

ions

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B

more of

F e

and

P b^{2 +}

ions

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C

more of

F e

and

P b

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D

more of

F e^{2 +}

and

P b^{2 +}

ions

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Solution

The correct option is A more of $P b$ and $F e^{2 +}$ ions
The more electropositive metal can displace less electropositive metal from its salt solution.
Iron is more electropositive than lead. Thus, iron can displace lead from its salt solution. When powdered Pb and Fe are added to a solution containing ${P b}^{2 +}$ and ${F e}^{2 +}$ ions, some ${P b}^{2 +}$ ions are reduced to Pb and some Fe is oxidized to ${F e}^{2 +}$ .

Hence, option A is correct.

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Similar questions

Q. Adding powdered

P b

F e

to a solution containing

1.0 M

P b^{2 +}

F e^{2 +}

ions would result in the formation of:
(Given :

E_{P b^{2 +} / P b}^{o}

E_{F e^{2 +} / F e}^{o}

= -0.44 V at 298 K)

Q. Adding powdered

P b

F e

to a solution containing

1.0 M

P b^{2 +}

F e^{2 +}

ions would result in the formation of:
(Given :

E_{P b^{2 +} / P b}^{o}

E_{F e^{2 +} / F e}^{o}

= -0.44 V at 298 K)

Q.
Adding powdered

P b

F e

to a solution containing 1 M each of

P b^{2 +}

F e^{2 +}

ions would result in the formation of:

(E_{P b^{2 +} / P b}^{0} = - 0.126 V, E_{F e^{2 +} / F e}^{0} = - 0.44 V)

E_{(P b^{2 +} | P b)}^{⊖} = - 0.126 V, E_{(Z n^{2 +} | Z n)}^{⊖} = - 0.763 V

25^{\circ} C

, calculate EMF of the cell:

Z n | Z n^{2 +} (1 M) | | P b^{2 +}

(1 M) | Pb. If an excess of metallic zn added to 1 M concentration of

P b^{2 +}

ions, The concentration of

P b^{2 +}

ions at equilibrium is

2.5 \times 10^{- x} M

value of x is..............

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

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