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Cupellation and Poling

Zone refining...

Question

Zone refining is a method to obtain:

A

Moderately pure metals

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B

Ultrapure Al

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C

Ultrapure metals

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D

ultrapure oxides

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Solution

The correct option is C
Ultrapure metals

Highly pure metals are obtained from zone refining method because the impurities melt and are collected in the impure zone. Since multiple passes can be made along the length of the metal (to be purified), the process yields very high purity levels.

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Q. Ultrapure elements are obtained in which of the following method of metal refining?

Q. Match items of Column I with the items of Column II and assign the correct code:

	Column I		Column II
(a)	Cyanide process	(i)	Ultrapure $G e$
(b)	Froth floatation process	(ii)	Dressing of $Z n S$
(c)	Electrolytic reduction	(iii)	Extraction of $A l$
(d)	Zone refining	(iv)	Extraction of $A u$
		(v)	Purification of $N i$

Q. Match list I with list II and select the correct answer using the codes given below the lists.

List I	List II
I. Cyanide process	A. Ultrapure $G e$
II. Floatation process	B. Pine oil
III. Electrolytic reduction	C. Extraction of $A l$
IV. Zone refining	D. Extraction of $A u$

Q. Which of the following, when doped into ultrapure germanium, will convert it into a p-type semiconductor?

List I	List II
i. Cyanide process	A. Ultrapure Ge
ii. Floating process	B. Pine oil
iii. Electrolytic reduction	C. Extraction of $A l$
iv. Zone refining	D. Extraction of $A u$

Match List-I with List-II and select the correct answer using the codes given below the lists:

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