Ncert Exercises & Solutions

Match the compounds/elements given in Column I with uses given in Column II.

	Column (Compound/element)		Column II (Use)
A.	Lanthanoid oxide	1.	Petroleum cracking
B.	Lanthanoid	2.	Television screen
C.	Mischmetal	3.	Lanthanoid metal + iron
D.	Mixed oxides of lanthanoids are employed	4.	Production of iron alloy

Codes:

Options:	A	B	C	D
1.	2	1	4	3
2.	1	2	3	4
3.	2	4	3	1
4.	4	1	3	2

Hint: Mischmetall which consists of a lanthanoid metal(~ 95%) and iron (~ 5%) and traces of S, C, Ca and Al.

The compounds and its use are as follows:

Compound / Element	Use
A. Lanthanoid oxide	Television screen
B. Lanthanoid	Production of iron alloy
C. Mischmetall	Lanthanoid metal + iron
D. Mixed oxides of lanthanoids are employed	Petroleum cracking

Yttrium, europium, and terbium phosphors are the red-green-blue phosphors used in many light bulbs, panels, and televisions.

Lanthanum-based catalysts are used to refine petroleum. Cerium(IV) oxide(CeO₂) is finding use as a petroleum cracking catalyst in petroleum refining.

Hence, option third is the correct answer.

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