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?

Gives an example list of many elements used in manufacturing a mobile phone including its screen, showing that screens commonly incorporate a variety of metals (e.g., aluminium, copper, silicon, cobalt, lithium, gold, silver).

A student could take this pattern (screens use conductive and optical metals/semiconductors) and check which of those (or similar) are classified as rare earths to see if any overlap with flat-panel displays.

Specifically notes lead is used in glass panels and gaskets in computer monitors, illustrating that display glass and related components contain heavy metals.

Use this as a precedent that display glass contains specialized metals and then compare to lists of rare earths used in display phosphors or components (e.g., yttrium, europium) to evaluate plausibility.

Mentions policy measure to reduce customs duty on parts of open cells of TV panels, implying TV panels are distinct manufactured components with specialized inputs.

Treat this as evidence panels have specific inputs; a student could look up typical panel component lists (glass, backlight, phosphors, semiconductors) and then test which rare earths are used in those subcomponents.

States many special metals are important for modern technologies and are used/recycled, signaling that advanced electronics (including displays) commonly use specialized metals.

Combine this general rule with a catalogue of modern display materials to narrow which specialized (possibly rare earth) metals are likely to be present in flat-panel screens.

Describes manganese's use to impart properties to alloys and mentions its industrial importance, illustrating the broader pattern that specific elements are chosen for particular functional properties in manufacturing.

Apply this pattern to displays: identify the functional needs of flat panels (luminescence, magnetism, conductivity) and then check which rare earths provide those functions (e.g., rare-earth phosphors for color/luminescence).

Mentions that luminescent sheets are doped with 'rare earth complexes' as luminescent species, linking rare earths to use in luminescence/phosphor applications.

A student could look up which specific rare‑earth ions (e.g., Eu, Tb, Ce) form luminescent complexes or are commonly used as phosphors in devices like LSCs or LEDs.

Explains that elements produce characteristic colours when heated (atomic emission/ luminescence), giving a general rule that elemental or ionic electronic transitions determine emitted colour.

Using this rule and a periodic table, a student can focus on elements with known f‑orbital transitions (rare earths) and check their characteristic emission colours to identify phosphorescent candidates.

Lists specific elements (example: phosphorus) as notable discoveries to investigate, suggesting textbooks prompt students to research element properties such as luminescence.

A student prompted by this could similarly research individual rare‑earth elements to see which show phosphorescence or are used as phosphors.