Purification of Nickel :
Nickel is refined by mond process
. (ii) Purification of Germanium : It is purified by zone refining method . It is based upon the fact that the impurities are more soluble in the melt than in the solid state of metal .
Which of the following method is used for purification of nickel?
Mond’s process
is the method used for refining of nickel metal. In this process, nickel is heated in a steam of carbon monoxide to form volatile nickel carbonyl Ni(CO)
4
.
For which of the following metals zone refining is used as method of refining?
Zone refining is a very useful method to get metals with
very high purity such as silicon and germanium
.
What is zone refining process?
: a
technique for the purification of a crystalline material and especially a metal in which a molten region travels through the material to be refined
, picks up impurities at its advancing edge, and then allows the purified part to recrystallize at its opposite edge.
Is nickel refined by zone refining?
Nickel is refined by
mond’s process
. Complete answer: Some of the methods that can be used for the refining of metals are distillation, liquation, poling, electrolysis, zone refining and vapour phase refining. Impure nickel metal is obtained from the reaction of nickel oxide with syngas at 473 K.
Is zirconium refined by zone refining?
Zinconium is best refines by Van Arkel method since ZrI4 being volatile can be easily separated from impurities and being unstable decomposes on heating to give pure Zr.
Which metal is used in Vapour phase refining?
The vapour phase refining technique is used for the refining of
nickel, titanium and zirconium metals
. . Nickel metal thus formed has some impurities of iron and cobalt.
How is nickel purified by monds process?
Note:The Mond process is a method for refining nickel.
The nickel oxide and impurities react with the hydrogen gas to form an impure solid nickel
. Nickel reacts with the carbon monoxide, forming nickel carbonyl, a gas. The impurities remain as solids.
How do you refine a nickel?
Through further refining a 95% pure nickel can be obtained by using
the fluid bed roasting technique
. The use of electric cells allows for a better refining process. The electrical cells equipped with inert cathodes removes the final impurities from the nickel, resulting in a high quality nickel.
Which of the following process is for refining pure nickel?
Nickel Refining is done by
Mond carbonyl process
. This process converts nickel oxides into pure nickel.
Which one is verified by zone refining method?
Hence, the correct answer is
germanium (Ge)
. Additional Information: We must remember that the zone refining is a technique based on the principle that impurities are more soluble in their corresponding melt state than their solid-state. It makes use of a circular heater which is placed in an ingot of metal.
Which one is purified by zone refining method?
For example, in the preparation of a transistor or diode semiconductor,
an ingot of germanium
is first purified by zone refining. Then a small amount of antimony is placed in the molten zone, which is passed through the pure germanium.
Is zone refining used for titanium?
These are the required conditions for vapour phase refining and so the method used for the refining of titanium is
Van Arkel method
as titanium has the conditions needed for it . … It is then decomposed by heating over a tungsten filament at 1700K to give pure titanium .
What is wrong with the zone refining?
Zone refining has been utilized as the ultimate purification technique for hundreds of substances, but it has the disadvantage of
being a relatively slow process
. Typical freezing rates are 0.1–2.0 cm/hr (0.04–0.8 in./hr) for organic substances and 0.5–30 cm/hr (0.2–12 in./hr) for inorganic substances.
What is the purpose of zone refining?
Zone refining process is
used to get the purest form of elements
. It is a very effective process in removal of impurities from semiconductors such as Ge, Ga and Si. Float zone refining process is used in solar cells. It is used to form a single layer of crystal.
What is zone refining give one example?
Hint: As the name suggests, ‘zone refining’ is a method for refining or purifying metals. This is also known as zone melting, because purification is done by melting the impurities. … This method is widely used for refining metals that have a low melting point. e.g.,
tin, lead, bismuth
.
