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Electrode Pot...

Electrode Potential

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Q.

A standard hydrogen electrode has zero electrode potential because

Hydrogen atom has only one electron.
The electrode potential is assumed to be zero.
Hydrogen is the lightest element.
Hydrogen is easiest to oxidize.

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Q. Given below are the half cell reactions:

M n^{2 +} (a q) + 2 e^{-} \to M n (s); E^{0} = - 1.18 V

2 (M n^{+ 3} (a q) + e^{-} \to M n^{2 +} (a q)); E^{0} = + 1.51 V

The

E^{0}

for

3 M n^{2 +} (a q) \to M n (s) + 2 M n^{3 +} (a q)

cell reaction will be:

$- 2.69 V$
$+ 2.69 V$
$+ 0.33 V$
$- 0.33 V$

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Q.

While $F e^{3 +}$ is stable, $M n^{3 +}$ is not stabe in acid solution because:
$(M n^{3 +} + e^{-} \to M n^{2 +}, E^{\circ} = 1.5 V; O_{2} + 4 H^{+} + 4 e^{-} \to 2 H_{2} O, E^{\circ} = + 1.23 V; F e^{3 +} + e^{-} \to F e^{2 +}, E^{\circ} = 0.77 V)$

$O_{2} o x i d i s e s M n^{2 +} t o M n^{3 +}$
$O_{2} o x i d i s e s M n^{2 +} a n d F e^{2 +} t o F e^{3 +}$
$F e_{3 +} o x i d i s e s H_{2} O t o O_{2}$
$M n^{3 +} o x i d i s e s H_{2} O t o O$

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Q. 1)What is oxidation number ? How to calculate the oxidation number ? 2)what is electronegativity and electropositive species ?

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Q. The electrode potential for

C u_{(a q)}^{2 +} + e^{-} \to C u_{(a q)}^{+}

and

C u_{(a q)}^{+} + e^{-} \to C u_{(s)}

are +0.15 V and +0.50 V respectively. The value of

E_{C u^{2 +} / C u}^{o}

will be:

0.150 V
0.500 V
0.325 V
0.65

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Q.

The tendency of a chemical species to acquire electrons from an electrode is measured by:

Oxidation potential
Reduction potential
Cell potential
None of these

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Q. A hydrogen gas electrode is made by dipping platinum wire in a solution of

H C l

of

p H = 10

and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be:
(NEET-UG-2013)

$0.118 V$
$0.59 V$
$0.059 V$
$1018 V$

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Q. Given three reactions:
Reaction 1 :

A (a q .) ⇌ A^{n +} (a q .) + n e^{-}

E^{\circ} = + 2 V

Reaction 2:

B (a q .) ⇌ B^{n +} (a q .) + n e^{-}

E^{\circ} = - 3 V

Reaction 3:

C^{n +} (a q .) + n e^{-} ⇌ C (a q .)

E^{\circ} = + 4 V

The correct decreasing order of the tendency of the species A, B and C to get oxidised is:

$A > B > C$
$C > B > A$
$A > C > B$
$B > C > A$

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Q. The

E^{o}

reduction for

C u / C u S

electrode is

- x

. Find the value of

x

.
(Given:

K_{s p}

for

C u S = 8.0 \times 10^{- 36}; E_{(C u / C u^{2 +})}^{o} = - 0.34 V; l o g 2 = 0.3; \frac{2.303 R T}{F} = 0.06

)

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Q.

Standard potential of two half cell E_{1}^{0} and E_{2}^{0} can not be added directly because they are

.

intensive properties
extensive properties
non- directional

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