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IMPORTANT

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From the given standard electrode potentials,
${Sn}^{4 +} (aq) + 2 e^{-} \to {Sn}^{2 +} (aq) E ° = 0.15 V$

${Br}_{2} (l) + 2 e^{-} \to 2 {Br}^{-} (aq) E ° = 1.07 V$

The approximate free energy change of the process $2 {Br}^{-} (aq) + {Sn}^{4 +} (aq) \to {Br}_{2} (l) + {Sn}^{2 +} (aq)$ is

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Important Questions on Electrochemistry

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JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 96

Concentration of

K^{+}

ions inside a biological cell was found to be

25

times higher than that outside. The magnitude of the potential difference between the two sides of the cell is close to (

2.303 RT / F

can be taken as

59 mV

; difference in concentrations of other ions can be taken as negligible)

EASY

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Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 98

The standard electrode potential

(E^{o})

of the Daniel cell is

1.1 V

Zn (s) + {Cu}^{2 +} (aq) ⟶ {Zn}^{2 +} (aq) + Cu (s) .

Under which of the following conditions will the cell potential be higher than

1.1 V

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Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 101

The specific conductance of saturated solution of silver bromide is

K (Ω^{- 1} {cm}^{- 1}) .

The limiting ionic conduction of

{Ag}^{+}

and

{Br}^{-}

ions are

a and b

, respectively. The solubility of

AgBr

g {lit}^{- 1}

is:
(Molar mass of

AgBr = 188 {gmol}^{- 1}

)

HARD

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 102

The conductance ratio

\frac{λ}{λ^{°}} = 0.936

Given this for a certain solution of

KCl

and

λ = 122 Ω^{- 1} {cm}^{2} {eq}^{- 1}

and

\frac{λ_{+}^{°}}{λ^{°}} = \frac{0.98}{1.98}

. Calculate the limiting values of ionic conductance of

K^{\oplus}

and

{Cl}^{-}

Ions in

Ω^{- 1} {cm}^{2} {eq}^{- 1}

HARD

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 103

Osmotic pressure of

0.1 M

weak acid

HA

3 atm .

If molar conductance of

0.1 M HA

30 Ω^{- 1} {cm}^{2} {mol}^{- 1}

. Then molar conductance at infinite dilution is:

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 117

$\underset{20 atm}{Pt, H_{2} (g)} |2 M {CH}_{3} {COONH}_{4} (aq) ‖ 2 M NaCl (aq)| \underset{20 atm}{H_{2} (g), Pt}$

Given ${pK}_{a} ({CH}_{3} COOH) = 4.74, {pK}_{b} = ({NH}_{4} OH) = 4.74$

If $E$ is emf of the cell in volt, calculate $1000 E .$ Take: $\frac{2.303 RT}{F} = 0.059$

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Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 123

The metal that cannot be displaced from its aqueous solution by zinc is.

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Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-4>Q 124

P

Q

R

and

S

are four metals whose typical reactions are given below:

(I)

Only

Q

and

R

react with dilute

HCl

to give

H_{2}

gas.

(II)

When

Q

is added to a solution containing the ions of the other metals, metallic

P

R

and

S

are formed?

(III)

P

reacts with concentrated

{HNO}_{3}

but

S

does not.
The correct order of their reducing character is:

From the given standard electrode potentials, Sn4+(aq)+2e-→Sn2+(aq) E°=0.15 V Br2(l)+2e-→2Br-(aq) E°=1.07 V The approximate free energy change of the process 2Br-(aq)+Sn4+(aq)→Br2(l)+Sn2+(aq) is

Important Questions on Electrochemistry

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From the given standard electrode potentials,
${Sn}^{4 +} (aq) + 2 e^{-} \to {Sn}^{2 +} (aq) E ° = 0.15 V$

${Br}_{2} (l) + 2 e^{-} \to 2 {Br}^{-} (aq) E ° = 1.07 V$

The approximate free energy change of the process $2 {Br}^{-} (aq) + {Sn}^{4 +} (aq) \to {Br}_{2} (l) + {Sn}^{2 +} (aq)$ is