Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>Exercise>Q 49

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Aluminium oxide may be electrolysed at $1000 {}^{\circ}C$ to furnish the aluminium metal (At. Mass $= 27 amu$ ; $1$ Faraday $= 96, 500$ Coulombs). The cathode reaction is ${Al}^{3 +} + 3 e^{-} \to {Al}^{}$ . To prepare $5.12 kg$ of aluminium metal by this method, If $5.49 \times 10^{y} C$ electricity would be required. then value of y will be.

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Important Questions on Electrochemistry

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 2

A concentrated solution of lead nitrate in water can be stored in:

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 3

In a Daniel cell in operation:

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 4

The cell potential of an electrochemical cell with the cell reaction $Zn + 2 {Ag}^{+} (0.0001 M) ⟶ {Zn}^{2 +} (0.1 M) + 2 Ag$ , is:

Given that the standard cell potential is $1.56 V$ .

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 5

Consider the following electrochemical cell:

$Zn (s) + 2 {Ag}^{+} (0.04 M) \to {Zn}^{2 +} (0.28 M) + 2 Ag (s)$

If ${E^{o}}_{cell} = 2.57$ , then the e.m.f. of the cell at $298 K$ , is:

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 6

The values of the limiting molar conductivity

(Λ °)

for

NaCl, HCl

and

NaOAc

are

126.4, 425.9

and

91.0 S {cm}^{2} {mol}^{- 1}

, respectively. For

HOAc .

Λ °

in

S {cm}^{2} mol^{- 1}

is

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 7

If,

E °_{{Fe}^{2 +} / Fe} = - 0.440 V

and

E °_{{Fe}^{3 +} / {Fe}^{2 +}} = 0.770 V

, then

E °_{{Fe}^{3 +} / Fe}

is:

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 8

The standard electrode potential of

{Zn}^{2 +} / Zn

is

- 0.76 V

, and that of

{Cu}^{2 +} / Cu

is

0.34 V

. The emf

(V)

and the free energy change

(kJ {mol}^{- 1})

, respectively, for a Daniel cell will be

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 4 - Electrochemistry>KVPY PROBLEMS (PREVIOUS YEARS)>Q 9

The density and equivalent weight of a metal are

10.5 g {cm}^{- 3}

and

100

, respectively. The time required for a current of

3 amp

to deposit a

0.005 mm

thick layer of the same metal on an area of

80 {cm}^{2}

is closest to