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How long (approximate) should water be electrolysed by passing through $100$ amperes current so that the oxygen released can completely burn $27.66 g$ of diborane? (Atomic weight of $B = 10.8 u$ )

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Important Questions on Electrochemistry

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 81

The anodic half-cell of lead-acid battery is recharged using electricity of

0 .05

Faraday. The amount of

{PbSO}_{4}

electrolyzed in

g

during the process is: (Molar mass of

{PbSO}_{4} = 303 g {mol}^{- 1}

)

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 82

Consider the following reduction processes:

{Zn}^{2 +} + 2 e^{-} \to Zn (s); E^{o} = - 0 .76 V

{Ca}^{2 +} + 2 e^{-} \to Ca (s); E^{o} = - 2 .87 V

{Mg}^{2 +} + 2 e^{-} \to Mg (s); E^{o} = - 2 .36 V

{Ni}^{2 +} + 2 e^{-} \to Ni (s); E^{o} = - 0 .25 V

The reducing power of the metals increases in the order:

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 83

In the cell:

$Pt (s) |H_{2} (g, 1 bar)| HCl (aq) | AgCl (s) | Ag (s) ∣ Pt (s)$

The cell potential is $0.92 V$ when a $10^{- 6} molal HCl$ solution is used. The standard electrode potential of ( $AgCl / Ag, C^{-}$ ) electrode is:

$\{Given, \frac{2.303 RT}{F} = 0.06 Vat 298 k\}$

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 84

For the cell $Zn (s) |{Zn}^{2 +} (aq) ‖ M^{x +} (aq)| M (s)$ , different half cells and their standard electrode potentials are given below:

$M^{x +} (aq) / M (s)$	${Au}^{3 +} (aq) / Au (s)$	${Ag}^{+} (aq) / Ag (s)$	${Fe}^{3 +} (aq) / {Fe}^{2 +} (aq)$	${Fe}^{2 +} (aq) / Fe (s)$
$E °_{M^{x +} / M^{(V)}}$	$1.40$	$0.80$	$0.77$	$- 0.44$

If $E_{{Zn}^{2 +} / Zn} = - 0.76 V$ , which cathode will give a maximum value of $E_{cell} °$ per electron transferred?

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 85

\land_{m}^{o}

for

NaCl, HCl

and

NaA

are

126.4, 425.9

and

100 .5 S {cm}^{2} {mol}^{- 1}

respectively. If the conductivity of

0 .001 M HA

5 \times 10^{- 5} S {cm}^{- 1}

, degree of dissociation of

HA

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 5>Q 1

Which of the following options will be correct for the stage of half completion of the reaction

A ⇌ B

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 5>Q 2

The standard electrode potentials (reduction) of

Pt / {Fe}^{3 +}, {Fe}^{2 +}

and

Pt / {Sn}^{4 +}, {Sn}^{2 +}

are

+ 0.77 V

and

0.15 V

respectively at

25 ° C

. The standard EMF of the reaction

{Sn}^{4 +} + 2 {Fe}^{2 +} ⟶ {Sn}^{2 +} + 2 {Fe}^{3 +}

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 5>Q 3

The standard oxidation potentials, $E °,$ for the half reactions are as:

$Zn ⟶ {Zn}^{2 +} + 2 e^{-}; E ° = + 0.76 V Fe ⟶ {Fe}^{2 +} + 2 e^{-}; E ° = + 0.41 V$

The EMF for the cell:

${Fe}^{2 +} + Zn \to {Zn}^{2 +} + Fe$

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane? (Atomic weight of B=10.8 u)

Important Questions on Electrochemistry

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How long (approximate) should water be electrolysed by passing through $100$ amperes current so that the oxygen released can completely burn $27.66 g$ of diborane? (Atomic weight of $B = 10.8 u$ )