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Redox Reactions

Short Answer Type

51.

What does positive electrode potential imply?

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52.

Why is it not possible to measure the single electrode potential?

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53.

What is electrochemical series?

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54. Copper does not dissolve in H₂SO₄. Why?

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55.

The standard electrode potentials of elements A, B and C are + 0.68, -2 .50 and -0.50 V respectively. Write the correct order of their reducing power.

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56.

The E° of Cu²⁺ | Cu is + 0 . 34 V. What does it signify?

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57.

What is the equivalent mass of the oxidation agent in the reaction

$SO subscript 2 plus space 2 straight H subscript 2 straight O space space rightwards arrow space space space 3 straight S space plus space 2 straight H subscript 2 straight O$

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58.

In the standardisation of Na₂S₂O₃using K₂Cr₂O₇ by iodometry, calculate the equivalent mass of K₂Cr₂O₇?

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Long Answer Type

59. Explain oxidation and reduction according to electronic concept. Give examples.

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60.
Define oxidising agents and reducing agents in terms of electronic concept ?

Oxidising agent: It is a substance which can accept one or more electrons from other substances. Thus, all those species (atom, ion or molecule) which undergo reduction are in fact, oxidising agents or oxidants, e.g. oxygen, nitric acid, permanganate ion etc. are oxidising agents.

Reducing agent: It is a substance which can readily lose one or more electrons to other substances. Thus, all those species (atom, ion or molecule) which undergo oxidation are in fact, reducing agents or reductant; e.g.sulphide ion, stannous ion, hydrogen peroxide etc. are reducing agents.