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Cupellation and Poling

Highly pure m...

Question

Highly pure metal can be obtained by zone refining.

A

True

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B

False

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Solution

The correct option is A True
Zone Refining (Fractional Crystallization): This method is employed to get metal of very high purity i,e. ultra pure samples of Ge Si, B,Ga,In. This method is based on the fact that impurities are more soluble than the pure metal in the melt .

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Q. (i) Metals can be recovered from their ores by chemical methods.

(ii) High purity metals can be obtained by zone refining method.

Which one is true /false.

Q. Assertion :Zone refining method is used to produce pure metals which are used as semiconductors. Reason: Semiconductors are used in highly pure form.

Zone refining often yields 80-85% pure metal.

Q. Assertion :Metals of high impurity are obtained by zone-refining. Reason: Impurities in the ore are more soluble in the metal than in the pure metal.

Choose the correct option.

Q. Give the correct order of initials T or F for following statements. Use T if statement is
true and F if it is false.
(i) Every mineral is an ore but every ore is not a mineral.
(ii) Slag is a product formed during extraction of metal by combination of flux and impurities.
(iii) Highly pure metals can be obtained by zone refining.
(iv) Carnallite is an ore of magnesium and sodium.

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