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Introduction to d and f Block Elements

32.Why hydrox...

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32.Why hydroxide of lanthanoid are less basic than actinides ??

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Q. Why basic character in lanthanoid hydroxides decreases across the period?

Q. The larger number of oxidation states are exhibited by the actinides than those by lanthanoids, the main reason being:

Q. The trend of basicity of lanthanoid hydroxides:

Q. Consider the following statements in respect of lanthanoids.
1. The basic strength of hydroxides of lanthanoids increases from L

a (O H)_{3}

L u (O H)_{4}

.
2. The lanthanoid ions

L u^{3 +}, Y b 6 2 +, C e^{4 +}

are diamagnetic.
Which of the statement(s) given above is are correct?

Q. Actinoid contraction is greater than lanthanoid contraction because the shielding effect of 5f orbitals is poorer than that of 4f orbitals, then why is the ionisation enthalpies of actinoids less than that of the lanthanoids?

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