Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 42

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Limiting molar conductivity of ${NH}_{4} OH$ $[$ i.e. $Λ {°_{m}}_{({NH}_{4} OH)}]$ is equal to

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Important Questions on Electrochemistry

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 43

Molar conductivities

(Λ_{m} °)

at infinite dilution of

NaCl

,

HCl

and

{CH}_{3} COONa

are

126.4, 425.9

and

91.0 {Scm}^{2} {mol}^{- 1}

respectively.

Λ_{m} °

for

{CH}_{3} COOH

will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 44

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

HCl

of

pH = 10

and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 45

At $25 ° C$ molar conductance of $0.1$ molar aqueous solution of ammonium hydroxide is $9.54$ ${ohm}^{- 1} {cm}^{2} {mol}^{- 1}$ and at infinite dilution its molar conductance is $238 ohm$ ${}^{- 1}{cm}^{2} {mol}^{- 1}$ . The degree of ionisation of ammonium hydroxide at the same concentration and temperature is :

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 46

A button cell used in watches function as following

Zn (s) + {Ag}_{2} O (s) + H_{2} O (ℓ) ⇌ 2 Ag (s) + {Zn}^{2 +} (aq) + 2 {OH}^{-} (aq)

If half cell potentials are

{Zn}^{2 +} (aq) + 2 e^{-} \to Zn (s); E ° = - 0.76 V

{Ag}_{2} O (s) + H_{2} O (ℓ) + 2 e^{-} \to 2 Ag (s) + 2 {OH}^{-} (aq)

E ° = 0.34 V

The cell potential will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 47

When

0.1 mol {MnO}_{4}^{2 -}

is oxidised the quantity of electricity required

{MnO}_{4}^{2 -}

to

{MnO}_{4}^{-}

completely to is-

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 48

The weight of silver (at. wt.

= 108

) displaced by a quantity of electricity which displaces

5600 mL

of

O_{2}

at STP will be

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 49

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as :

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 4>Q 50

The pressure of

H_{2}

required to make the potential of

H_{2}

- electrode zero in pure water at

298 K

is