Consider the following statements: 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?

Consider the following statements: Statement I: Some rare earth…

Both Statement I and Statement II are correct and Statement II explains Statement I
Both Statement I and Statement II are correct but Statement II does not explain Statement I
Statement I is correct but Statement II is not correct
Statement I is not correct but Statement II is correct

Answer

Both Statement I and Statement II are correct and Statement II explains Statement I

Statement I: Correct. Rare earth elements such as europium, terbium and yttrium are used in display technologies like flat TV screens and computer monitors, mainly in phosphor coatings for colour display.

Statement II: Correct. Several rare earth elements have luminescent/phosphorescent properties and are widely used in phosphors.

Link: Statement II explains Statement I because these phosphorescent/luminescent properties are the reason rare earth elements are used in screens and monitors.

Both Statement I and Statement II are correct and Statement II explains Statement I

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