Select the incorrect statement:

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Actinides shows large number of oxidation states than that of corresponding lanthanides

Pyrophoric alloy is 3% misch metal mixed with Mg

The size of lanthanides M³⁺ ions increases as the atomic number of M increases

Electronic spectra of lanthanide show very broad bands

answer is C.

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Detailed Solution

Although both 5f and 4f orbitals have similar shape and their angular part of the wave function resembles but 4f orbitals is much more penetrated than 5f orbital towards nucleus. Thus energy difference between 5f and 6d (actinides) orbitals is less than between 4f and 5d orbitals (lanthanides).

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