Cerium dioxide $\ce{CeO_{2}}$ is used in gas lamp material. The oxides of lanthanum, cerium, yttrium and magnesium are used for gas lamp materials.
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In the form of dichromate, $\ce{Cr(VI)}$ is a strong oxidising agent in acidic medium but $\ce{Mo (VI)}$ in $\ce{MoO_3}$ and $\ce{W(VI)}$ in $\ce{WO_3}$ are not because $.........$