What is the general molecular formula of the products obtained on heating lanthanoid (Ln) with sulphur?

Options

A. `LnS`
B. `LnS_3`
C. `Ln_3S_2`
D. `Ln_2S_3`

Answer

D

Explanation

`+3` oxidation state is most common for lanthanoids. So the chemical formula of its sulphide is `Ln^(3+) S^(2-) or Ln_2S_3`.