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The d-And-f-Block Elements

Short Answer Type

51. The first ionisation energies of third transition series is higher than those of first and second transition series. Why?

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52.

For the first row transition metals the E° values are:
E° V Cr Mn Fe Co Mc Cu
(M²⁺/M) –1.18 –0.91 –1.18 –0.44 –0.28 –0.25 +0.34
Explain the irregularity in the above values.

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53. Why is the E° value for the Mn³⁺/Mn²⁺ couple much more positive than that for Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺? Explain.

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54. What would be the nature of copper(I) oxide?

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55.

Calculate the magnetic moment of a divalent ion in aqueous solution its atomic number is 25.

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56. Give the formula for finding out the magnetic moment of an atom.

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57. What is the unit of magnetic moment (μ)?

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58. The d-electron configuration of Co²⁺ and Cu²⁺ is d⁷ and d⁹ respectively. Which one of these ions will be more paramagnetic?

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59. The d-electron configuration of Mn²⁺ and Ti²⁺ is d⁵ and d² respectively. Which one of these ions will be more paramagnetic?

Paramagnetic behaviour depend on the upaired electron. Mn²⁺ has more unpaired electrons (five electrons unpaired) and thus will be more paramagnetic than Ti²⁺ (only two electrons unpaired).

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