Match List-I with List-II

List-I	List-II
Compound/Elements	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:

The correct option is (A) – (I), (B) – (III), (C) – (II), (D) – (IV).

Let us analyze the matches between List-I and List-II step-by-step based on the chemical properties and applications of lanthanoids and their alloys:

(A) Magnesium-based alloy:
Magnesium based alloys, specifically those containing about 3% misch metal, are known for their high strength and lightweight properties. They are widely used in making defensive and structural equipment, such as bullets, shells, and lighter parts.
Hence, (A) matches with (I) Bullets.

(B) Lanthanoid oxide:
Lanthanoid oxides are widely used in electronics and materials science. Specifically, oxides of elements like europium, yttrium, and other lanthanoids are employed as phosphors in display technologies, including television screens, to produce vibrant colors.
Hence, (B) matches with (III) Television screen.

(C) Mixed oxides of Lanthanoids:
Mixed oxides of lanthanoids serve as excellent catalysts in the petrochemical industry. They are specifically employed in the cracking of petroleum (zeolite-based cracking catalysts containing lanthanoid ions) to break down heavy hydrocarbons into lighter fractions like gasoline.
Hence, (C) matches with (II) Petroleum cracking.

(D) Misch metal:
Misch metal is a well-known alloy consisting of lanthanoid metals (about 95%), iron (about 5%), and traces of other elements like sulfur, carbon, calcium, and aluminum. Therefore, its primary constituent composition is lanthanoid metal and iron.
Hence, (D) matches with (IV) Lanthanoid metal and iron.

By putting all these individual associations together:
(A) → (I)
(B) → (III)
(C) → (II)
(D) → (IV)
This perfectly matches the second option.