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The transition elements (d-block elements) show variable oxidation states because

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the energy difference between (n-1)d and ns electrons is very less, thus (n-1)d electrons also behave like valence electrons

of the presence of electrons in np and nd orbitals

of the presence of ns and nd orbitals

of the presence of ns, np and nd electrons

answer is B.

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Detailed Solution

Due to less energy difference between (n–1)d and ‘ns’ sub levels, in addition to ‘ns’ electrons (n–1)d electrons also participate in bond formation

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