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Write a short note on uses of lanthanoids.

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Uses of lanthanoids:

i. Lanthanoids do not find any use in the pure state. The most important use of lanthanoids is in the production of alloy steels to improve the strength and workability of steel.

ii. Their oxides (eg. La2O3) are used in glass industry, for polishing glass and for making coloured glasses for goggles as they give protection against UV light and as phosphor for television screens and similar fluorescing surfaces. Mixed oxides of lanthanoids are used as catalysts in petroleum cracking. 

iii. Because of their paramagnetic and ferromagnetic properties, their compounds are used in making magnetic and electronic devices. 

iv. Ceric sulphate is a well known oxidizing agent in volumetric analysis.

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