Discussion
The type of sulphide formed by Lanthanoids is
Answer: D
Lanthanoids form sulphides of the type \(Ln_{2}S_{3}\).
The characteristic oxidation state of the lanthanoids is +3. With sulphide (\(S^{2-}\)) that gives the formula \(Ln_{2}S_{3}\), formed when the metals are heated with sulphur.
\(LnS\), \(LnS_{2}\), \(LnS_{3}\) and \(Ln_{2}S\) would correspond to +2, +4, +6 and +1 states, which are not the typical state.
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