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The d-And-f-Block Elements

Short Answer Type

41.

Why V and Mn has E° value more than E° value of Cr?

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42. What may be the stable oxidation state of the transition elements with the following d-electron configurations in the ground state of their atoms 3d³, 3d⁵, 3d⁸ and 3d⁴?

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43. Transition metals tend to be less reactive. Explain

It is due to high heat of sublimation, high ionisation energy and low heat of hydration.

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44.

Compare qualitatively the first and second ionisation potentials of copper and zinc. Explain the above observation.

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45.

What does the E° value of M³⁺/M²⁺ show for Mn³⁺and Co³⁺ (+ 1.57 and 1.97 V respectively)?

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46. Ti²⁺, V²⁺and Cr²⁺are strong reducing agents. Why?

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47. Give a reaction to show that Cr²⁺ acts as a reducing agent.

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48. Why is the E° value for Mn³⁺/Mn²⁺ higher than that of Cr³⁺/ Cr²⁺ (or Fe³⁺/Fe²⁺)?

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49. How would you account for the increasing oxidising power in the series VO₂⁺< Cr₂O₇^2– < MnO₄–?

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50. The ionisation enthalpies of Cr and Cu are larger than their neighbours. Why?

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