Describe a method for refining nickel.

लघु उत्तर

Mond’s process refines nickel. In this process, nickel is heated in the presence of carbon monoxide to form nickel tetracarbonyl, a volatile complex.

\[\ce{Ni + 4 CO ->[330 - 350 K] \underset{Nickel tetracarbonyl}{Ni(CO)4}}\]

Then, the obtained nickel tetracarbonyl is decomposed by subjecting it to a higher temperature (450-470 K) to obtain pure nickel metal.

\[\ce{\underset{tetracarbonyl}{\underset{Nickel}{Ni(CO)4}} ->[450-470 K] \underset{Nickel}{Ni} + 4CO}\]

shaalaa.com

या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?

Name the method used for the refining of Nickel metal.

Name the method used for the refining of zirconium.

Name the method of refining of metals such as Germanium.

Describe the roles of the following: NaCN in froth floatation process

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What is meant by the term “chromatography”?

Outline the principles behind the refining of metals by the following methods:

Zone refining method

Why is an external emf of more than 2.2 V required for the extraction of \[\ce{Cl2}\] from brine?

Give two requirements for vapour phase refining.

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

Column I	Column II
(A) Coloured bands	(1) Zone refining
(B) Impure metal to volatile complex	(2) Fractional distillation
(C) Purification of Ge and Si	(3) Mond Process
(D) Purification of mercury	(4) Chromatography
	(5) Liquation

Assertion: Zone refining method is very useful for producing semiconductors.

Reason: Semiconductors are of high purity.

Electrolytic reduction method is used for the extraction of ______.

Refining using liquation method is the most suitable for metals with ______.

Describe a method for refining nickel.