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The d & f Block Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
Question
$.........$ is used in gas lamp material.
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Answer

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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