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CHXII03:ELECTROCHEMISTRY

330103 Standard reduction potentials of the half reactions are given below:
$F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{o} = + 2.85 V$
$C l_{2} (g) + 2 e^{-} \to 2 C l^{-} (a q); E^{o} = + 1.36 V$
$B r_{2} (l) + 2 e^{-} \to 2 B r^{-} (a q); E^{o} = + 1.06 V$
$I_{2} (s) + 2 e^{-} \to 2 l^{-} (a q); E^{o} = + 0.53 V$
The strongest oxidising and reducing agents respectively are

1

C l_{2} a n d B r^{-}

2

B r_{2} a n d C l^{-}

3

F_{2} a n d I^{-}

4

C l_{2} a n d I_{2}

Explanation:

The given values are $E_{R P}^{O}$ . More is $E_{R P}^{O}$ more is the tendency to gain electron or to show reduction or to show strong oxidant nature.

CHXII03:ELECTROCHEMISTRY

330104 A gas X at 1 atm is bubbled through a solution containing a mixture of $1 M Y^{-} a n d 1 M Z^{-} a t 25^{\circ} C$ . If the reduction potential is Z > Y > X, then

1 Y will oxidise X and not Z

2 Y will oxidise Z and not X

3 Y will oxidise both X and Z

4 Y will reduce both X and Z

CHXII03:ELECTROCHEMISTRY

330105 $Zn$ gives $H_{2}$ gas with $H_{2} {SO}_{4}$ and $HCl$ but not with ${HNO}_{3}$ because:

1

Zn

acts as oxidising agent when reacts with

{HNO}_{3}

2

{HNO}_{3}

is weaker acid than

H_{2} {SO}_{4}

and

HCl

3 In electrochemical series,

Zn

is above hydrogen

4

{NO}_{3}^{-}

is reduced in preference to hydronium ion

Explanation:

Nitric acid is a strong oxidising agent and reacts with zinc in the following manner.
$Zn + 4 {HNO}_{3} \to Zn {({NO}_{3})}_{2} + 2 {NO}_{2} + 2 H_{2} O$

CHXII03:ELECTROCHEMISTRY

330106 Identify the weakest oxidising agent among the following.

1

L i^{+}

2

N a^{+}

3

C d^{2 +}

4

l_{2}

Explanation:

Lithium ion has small size, it has the highest hydration enthalpy, which compensate its high ionisation energy and therefore, its $E^{o}$ value is most negative. Thus, Li is the most powerful reducing agent in aqueous solution.

MHTCET - 2017

CHXII03:ELECTROCHEMISTRY

330103 Standard reduction potentials of the half reactions are given below:
$F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{o} = + 2.85 V$
$C l_{2} (g) + 2 e^{-} \to 2 C l^{-} (a q); E^{o} = + 1.36 V$
$B r_{2} (l) + 2 e^{-} \to 2 B r^{-} (a q); E^{o} = + 1.06 V$
$I_{2} (s) + 2 e^{-} \to 2 l^{-} (a q); E^{o} = + 0.53 V$
The strongest oxidising and reducing agents respectively are

1

C l_{2} a n d B r^{-}

2

B r_{2} a n d C l^{-}

3

F_{2} a n d I^{-}

4

C l_{2} a n d I_{2}

Explanation:

The given values are $E_{R P}^{O}$ . More is $E_{R P}^{O}$ more is the tendency to gain electron or to show reduction or to show strong oxidant nature.

CHXII03:ELECTROCHEMISTRY

330104 A gas X at 1 atm is bubbled through a solution containing a mixture of $1 M Y^{-} a n d 1 M Z^{-} a t 25^{\circ} C$ . If the reduction potential is Z > Y > X, then

1 Y will oxidise X and not Z

2 Y will oxidise Z and not X

3 Y will oxidise both X and Z

4 Y will reduce both X and Z

CHXII03:ELECTROCHEMISTRY

330105 $Zn$ gives $H_{2}$ gas with $H_{2} {SO}_{4}$ and $HCl$ but not with ${HNO}_{3}$ because:

1

Zn

acts as oxidising agent when reacts with

{HNO}_{3}

2

{HNO}_{3}

is weaker acid than

H_{2} {SO}_{4}

and

HCl

3 In electrochemical series,

Zn

is above hydrogen

4

{NO}_{3}^{-}

is reduced in preference to hydronium ion

Explanation:

Nitric acid is a strong oxidising agent and reacts with zinc in the following manner.
$Zn + 4 {HNO}_{3} \to Zn {({NO}_{3})}_{2} + 2 {NO}_{2} + 2 H_{2} O$

CHXII03:ELECTROCHEMISTRY

330106 Identify the weakest oxidising agent among the following.

1

L i^{+}

2

N a^{+}

3

C d^{2 +}

4

l_{2}

Explanation:

Lithium ion has small size, it has the highest hydration enthalpy, which compensate its high ionisation energy and therefore, its $E^{o}$ value is most negative. Thus, Li is the most powerful reducing agent in aqueous solution.

MHTCET - 2017

CHXII03:ELECTROCHEMISTRY

330103 Standard reduction potentials of the half reactions are given below:
$F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{o} = + 2.85 V$
$C l_{2} (g) + 2 e^{-} \to 2 C l^{-} (a q); E^{o} = + 1.36 V$
$B r_{2} (l) + 2 e^{-} \to 2 B r^{-} (a q); E^{o} = + 1.06 V$
$I_{2} (s) + 2 e^{-} \to 2 l^{-} (a q); E^{o} = + 0.53 V$
The strongest oxidising and reducing agents respectively are

1

C l_{2} a n d B r^{-}

2

B r_{2} a n d C l^{-}

3

F_{2} a n d I^{-}

4

C l_{2} a n d I_{2}

Explanation:

The given values are $E_{R P}^{O}$ . More is $E_{R P}^{O}$ more is the tendency to gain electron or to show reduction or to show strong oxidant nature.

CHXII03:ELECTROCHEMISTRY

330104 A gas X at 1 atm is bubbled through a solution containing a mixture of $1 M Y^{-} a n d 1 M Z^{-} a t 25^{\circ} C$ . If the reduction potential is Z > Y > X, then

1 Y will oxidise X and not Z

2 Y will oxidise Z and not X

3 Y will oxidise both X and Z

4 Y will reduce both X and Z

CHXII03:ELECTROCHEMISTRY

330105 $Zn$ gives $H_{2}$ gas with $H_{2} {SO}_{4}$ and $HCl$ but not with ${HNO}_{3}$ because:

1

Zn

acts as oxidising agent when reacts with

{HNO}_{3}

2

{HNO}_{3}

is weaker acid than

H_{2} {SO}_{4}

and

HCl

3 In electrochemical series,

Zn

is above hydrogen

4

{NO}_{3}^{-}

is reduced in preference to hydronium ion

Explanation:

Nitric acid is a strong oxidising agent and reacts with zinc in the following manner.
$Zn + 4 {HNO}_{3} \to Zn {({NO}_{3})}_{2} + 2 {NO}_{2} + 2 H_{2} O$

CHXII03:ELECTROCHEMISTRY

330106 Identify the weakest oxidising agent among the following.

1

L i^{+}

2

N a^{+}

3

C d^{2 +}

4

l_{2}

Explanation:

Lithium ion has small size, it has the highest hydration enthalpy, which compensate its high ionisation energy and therefore, its $E^{o}$ value is most negative. Thus, Li is the most powerful reducing agent in aqueous solution.

MHTCET - 2017

CHXII03:ELECTROCHEMISTRY

330103 Standard reduction potentials of the half reactions are given below:
$F_{2} (g) + 2 e^{-} \to 2 F^{-} (a q); E^{o} = + 2.85 V$
$C l_{2} (g) + 2 e^{-} \to 2 C l^{-} (a q); E^{o} = + 1.36 V$
$B r_{2} (l) + 2 e^{-} \to 2 B r^{-} (a q); E^{o} = + 1.06 V$
$I_{2} (s) + 2 e^{-} \to 2 l^{-} (a q); E^{o} = + 0.53 V$
The strongest oxidising and reducing agents respectively are

1

C l_{2} a n d B r^{-}

2

B r_{2} a n d C l^{-}

3

F_{2} a n d I^{-}

4

C l_{2} a n d I_{2}

Explanation:

The given values are $E_{R P}^{O}$ . More is $E_{R P}^{O}$ more is the tendency to gain electron or to show reduction or to show strong oxidant nature.

CHXII03:ELECTROCHEMISTRY

330104 A gas X at 1 atm is bubbled through a solution containing a mixture of $1 M Y^{-} a n d 1 M Z^{-} a t 25^{\circ} C$ . If the reduction potential is Z > Y > X, then

1 Y will oxidise X and not Z

2 Y will oxidise Z and not X

3 Y will oxidise both X and Z

4 Y will reduce both X and Z

CHXII03:ELECTROCHEMISTRY

330105 $Zn$ gives $H_{2}$ gas with $H_{2} {SO}_{4}$ and $HCl$ but not with ${HNO}_{3}$ because:

1

Zn

acts as oxidising agent when reacts with

{HNO}_{3}

2

{HNO}_{3}

is weaker acid than

H_{2} {SO}_{4}

and

HCl

3 In electrochemical series,

Zn

is above hydrogen

4

{NO}_{3}^{-}

is reduced in preference to hydronium ion

Explanation:

Nitric acid is a strong oxidising agent and reacts with zinc in the following manner.
$Zn + 4 {HNO}_{3} \to Zn {({NO}_{3})}_{2} + 2 {NO}_{2} + 2 H_{2} O$

CHXII03:ELECTROCHEMISTRY

330106 Identify the weakest oxidising agent among the following.

1

L i^{+}

2

N a^{+}

3

C d^{2 +}

4

l_{2}

Explanation:

Lithium ion has small size, it has the highest hydration enthalpy, which compensate its high ionisation energy and therefore, its $E^{o}$ value is most negative. Thus, Li is the most powerful reducing agent in aqueous solution.

MHTCET - 2017

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