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

L n S

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L n S_{3}

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L n_{3} S_{2}

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L n_{2} S_{3}

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Solution

The correct option is B $L n_{2} S_{3}$
Heating lanthanides with sulphur form corresponding sulphides:

$2 L n + 3 S ⟶ {L n}_{2} S_{3}$

Hence, option $D$ is correct.

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