Match compound/elements of List-I with their uses given in List-II
|
List-I (Compound/Elements) |
List-II (Uses) |
|
(A) Magnesium based alloy is constituent of |
(I) Bullets |
|
(B) Lanthanoid oxide |
(II) Petroleum cracking |
|
(C) Mixed oxides of Lanthanoids are employed in |
(III) Television screen |
|
(D) Misch metal |
(IV) Lanthanoid metal and iron |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
The lanthanoids have several everyday uses: in alloys, as catalysts and as phosphors.
(A) Magnesium based alloy is constituent of — This matches (I) Bullets. Mischmetall mixed with magnesium gives an alloy used to make bullets, shells and lighter flints.
(B) Lanthanoid oxide — This matches (III) Television screen. Some individual lanthanoid oxides glow when struck by electrons and are used as phosphors in television screens and similar fluorescent surfaces.
(C) Mixed oxides of Lanthanoids are employed in — This matches (II) Petroleum cracking. Mixtures of lanthanoid oxides act as catalysts in petroleum cracking.
(D) Misch metal — This matches (IV) Lanthanoid metal and iron. Mischmetall is an alloy of a lanthanoid metal (about 95%) and iron (about 5%), with traces of S, C, Ca and Al.
Shortcut: (D)-(IV) appears in Options (1) and (2); (B)-(III) then leaves only Option (2).
NCERT (2026-27 edition):
General Characteristics – …
