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?

Question

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?

Accepted Answer

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

Explanation: Rare Earth Elements (REEs) such as Europium, Terbium, and Yttrium are widely used in modern display technologies. Statement I is Correct: Some rare earth elements are used in flat TV screens and computer monitors. Statement II is Correct: These elements possess phosphorescent properties, meaning they can absorb energy and emit light. Statement II explains Statement I because these phosphorescent properties help produce bright, vibrant, and accurate colors in display screens. Therefore, Option A is the correct answer. Statement-wise Analysis Statement Status Explanation Statement I: REEs are used in flat TV screens and monitors ✅ Correct Europium, Terbium, and Yttrium are used in display technologies for color generation. Statement II: Some REEs have phosphorescent properties ✅ Correct These elements can emit visible light after absorbing energy. Relationship ✅ Correct Phosphorescence is the reason REEs are valuable in screens and monitors. Rare Earth Elements (REEs) What are Rare Earth Elements? Rare Earth Elements are a group of 17 metallic elements consisting of: 15 Lanthanides Scandium Yttrium Important Applications Flat-screen TVs and monitors Smartphones Electric Vehicles (EVs) Wind turbines Defence equipment Medical imaging devices Phosphorescence Phosphorescence is the ability of a material to: Absorb energy Store it temporarily Emit light gradually This property helps create: Bright displays High color accuracy Better screen efficiency Important REEs Used in Displays Element Use Europium Red color phosphors Terbium Green color phosphors Yttrium Display and LED phosphors

Detailed Explanation:

Statement-wise Analysis

Rare Earth Elements (REEs)

What are Rare Earth Elements?

Important Applications

Phosphorescence

Important REEs Used in Displays

Question 1 of 1 Advanced Materials

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Statement	Status	Explanation
Statement I: REEs are used in flat TV screens and monitors	✅ Correct	Europium, Terbium, and Yttrium are used in display technologies for color generation.
Statement II: Some REEs have phosphorescent properties	✅ Correct	These elements can emit visible light after absorbing energy.
Relationship	✅ Correct	Phosphorescence is the reason REEs are valuable in screens and monitors.

Element	Use
Europium	Red color phosphors
Terbium	Green color phosphors
Yttrium	Display and LED phosphors