Statement I: Some rare earth elements are used in the manufacture of flat television, screens and computer monitors,

Statement II: Some rare earth elements have phosphorescent properties.

Which one of the following is correct in respect of the above statements?

(a) Both Statement I and Statement II are correct and Statement II explains Statement I

(b) Both Statement I and Statement II are correct but Statement II doesnot explain Statement I

(c) Statement I is correct but Statement II is not correct

(d) Statement I is not correct but Statement II is correct

Ans-a

Explanation

Rare earth elements are used in several high technology industrial products.

In the ceramic and glass industry rare earth element containing compounds are used for high temperature materials, for coatings, polishing, coloring, decoloring and as glass additives. The main other uses of rare earth elements are in permanent magnets, phosphors in color television tubes, x-ray tubes, fluorescent lamps, electronic and computer devices and lighter flints. 

Hence statement 1 is correct 

Rare Earth Metals (REM) like europium and terbium are known for their phosphorescent properties

Hence statement 2 is correct  and explains statement 1

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