Fill in the blanks:
$1.$ Heating lanthanoids with sulfur gives .......
$2.$ Mixed oxides of lanthanoids are used as catalysts in ..........
$1.$ Heating lanthanoids with sulfur gives .......
$2.$ Mixed oxides of lanthanoids are used as catalysts in ..........
(N/A) $1.$ Heating lanthanoids with sulfur gives lanthanoid sulfides $(Ln_2S_3)$.
$2.$ Mixed oxides of lanthanoids are used as catalysts in petroleum cracking.
$2.$ Mixed oxides of lanthanoids are used as catalysts in petroleum cracking.
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