Cupellation and Poling

Q. The method used for the purification of Indium is:

1. Van Arkel method
2. Vapour phase refining
3. Zone refining
4. Liquation

Q.

1. True
2. False

Q. Outline the principles of refining of metals by the following methods :
(i) Zone refining
(ii) Vapour phase refining

Q. The method used for the purification of Indium is

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Q. Zone refining is based on the principle that _____

1. impurities of low boiling metals can be separated by distillation
2. impurities are more soluble in the melt than in solid metal
3. different components of a mixture are differently adsorbed on an adsorbent.
4. vapour of volatile compound can be decomposed in pure metal.

Q.

Zone refining is also known as fractional __

Q. Zone refining process is used for the:

1. Purification of metal
2. Concentration of an ore
3. Reduction of a metal oxide
4. Purification of an ore

Q. The method of zone refining of metals is based on the principle of:

1. greater mobility of the pure metal than that of impurity
2. greater noble character of the solid metal than that of the impurity
3. higher melting point of the impurity than that of the pure metal
4. greater solubility of the impurity in the molten state than in the solid

Q. The method used for the purification of Indium is:

1. Van Arkel method
2. Vapour phase refining
3. Zone refining
4. Liquation

Q.

Zone refining often yields 80-85% pure metal – True or False?

1. True

2. False

Q. Select correct statement regarding silver extraction process.

1. Zinc forms an alloy with silver, from which zinc is separated by distillation.
2. Zinc forms an alloy with lead, from which lead is separated by distillation.
3. When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.
4. When the lead-silver alloy is rich in lead, lead is removed by parker's or pattinson's process.

Q. Which of the following methods is used for obtaining metals of very high purity?

1. Distillation
2. Zone refining
3. Liquation
4. Electrolytic refining

Q.

Zone refining is based on the principle of that the impurities tend to be in the melt than in the solid metal.

1. False

2. True

Q. Zone refining method is used for refining:

1. $Al$
2. $Ge$
3. $Cu$
4. $Fe$

Q. Zone-refining has been employed for preparing ultra-pure samples of:

1. Cu
2. Zn
3. Ge
4. Ag

Q.

Zone refining is also known as fractional __

Q.

Zone refining often yields 80-85% pure metal – True or False?

1. False

2. True

Q.

Zone refining is a method to obtain:

1. Ultrapure metals

2. ultrapure oxides

3. Moderately pure metals

4. Ultrapure Al

Q. State briefly the principles which serve as basis for the following operation in metallurgist.
Zone refining.