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The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because

the 5f orbitals are more buried than the 4f orbitals
there is a similarity between 4f and 5f orbitals in their angular part of the wave function
the actinoids are more reactive than the lanthanoids
the 5f orbitals extend further from the nucleus than the 4f orbitals
Additional Questions

The bonds present in the structure of dichromate ion are

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Which of the following lanthanoid ions is diamagnetic? (At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

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The methods chiefly used for the extraction of lead and tin from their ores are respectively

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Which do not decolourise KMnO4 aqueous solution?

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(NH4)2Cr2O7 on heating gives a gas which is also given by

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Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

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Which of the statements is not true?

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During the extraction of gold the following reactions take place

Au + CN + H2O $\xrightarrow{O_2}$ [X]

[X] + Zn → [Y] + Au

X and Y are respectively

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Which of the following is a Ferrous alloy

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Identify the incorrect statement among the following

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