A) The ionic size of Ln (III) decrease in general with increasing atomic number.
B) Ln (III) compounds are generally colourless.
C) Ln (III) hydroxide are mainly basic in character.
D) Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.
Correct Answer: B
Solution :
[b] Most of the \[L{{n}^{3+}}\] compounds except \[L{{a}^{3+}}\]and \[L{{u}^{3+}}\] are coloured due to the presence of f-electrons.
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