Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-5>Q 37

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The reduction potential of hydrogen electrode when placed in a buffer solution is found to be $- 0.413 V$ . The $pH$ of the buffer is:-

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Important Questions on Electrochemistry

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Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-5>Q 39

The oxidation potentials of

Zn, Cu, Ag, H_{2}

and

Ni

are

0.76, - 0.34, - 0.80, 0.00, 0.25 volt,

respectively. Which of the following reactions will provide maximum voltage?

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Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-5>Q 50

A silver coulomb meter is in series with a cell electrolyzing water. In a time of

1 minute

1 minute at a constant current,

1.08 g

silver got deposited on the cathode of the coulometer. What total volume

(In mL)

of the gases would have produced in other cell if in this cell the anodic and cathodic efficiencies were

90 %

and

80 %

respectively. Assume

STP

conditions and the gases collected are dry.

(Ag - 108)

(Molar volume of any ideal gas at

STP = 22.4 L

. Report as (your answer

\div 10 .)

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Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-5>Q 60

Peroxodisulphate salts $({Na}_{2} S_{2} O_{8})$ are strong oxidizing agents used as bleaching agents for fats, oil etc.
Given

$\begin{array}{l} O_{2} (g) + 4 H^{\oplus} (aq) + 4 e^{-} ⟶ 2 H_{2} O (ℓ) & E ° = 1.23 V \end{array}$

$\begin{array}{l} S_{2} O_{8}^{- 2} + 2 e^{-} ⟶ 2 {SO}_{4}^{- 2} (aq) & E ° = 2.01 V \end{array}$

Which of the following statements is (are) correct?