Ncert Exercises & Solutions

Match Compound/element in Column-I with uses in Column-II and select the best match from the codes given:

	Column-I (Compound/element)		Column-II (Uses)
A.	Lanthanoid oxide	I.	Petroleum cracking
B.	Lanthanoid	II.	Television screen
C.	Mischmetal	III.	Lanthanoid metal + iron
D.	Mixed oxides of lanthanoids are employed	IV.	Production of iron alloy

Options:	A	B	C	D
1.	II	I	IV	III
2.	I	II	III	IV
3.	II	IV	III	I
4.	IV	I	III	II

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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