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The trend in ionisation enthalpy of a transition element is not regular because
(a)Removal of one electron alters the relative energies of and orbitals
(b)Due to different E.C. (stability)
(c)Poor screening of orbital
(d)Due to decrease in effective nuclear charge

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Important Questions on The d and f-Block Elements
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The element having lowest

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Choose the correct pair regarding

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Which of the following element does not show the variable oxidation state?

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With highest stable oxidation state of is

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With highest possible oxidation state of is

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Oxygen stabilises higher oxidation state because

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Which of the following have highest magnetic moment?

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Reduction potential of will depend on
