Which of the following statements is/are correct? (a) Tendency to form complexes: \( \mathrm{Sc}...

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Which of the following statements is/are correct?
(a) Tendency to form complexes: \( \mathrm{Sc}^{3+}\mathrm{Y}^{3+}\mathrm{La}^{3+} \).
(b) Most of \( \operatorname{Ln}^{3+} \) complexes are coloured.
(c) \( \operatorname{Ln}( \) II) hydroxides are mainly basic in character.
(d) Lanthanoids release \( \mathrm{H}_{2} \) gas on reaction with strong acids.
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