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Refining methods: zone refining, van Arkel, Mond process, electrolytic refining

27 questions on Refining methods: zone refining, van Arkel, Mond process, electrolytic refining from the Metallurgy chapter: 5 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

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Zone refining is based on the principle that NEET level
Impure nickel is converted into a volatile compound by passing carbon monoxide over it at about 330-350 K in the Mond process. The volatile compound is NEET level
During the electrolytic refining of copper, pure copper is deposited on NEET level
Which pair of metals is obtained in ultrapure form by the van Arkel method? NEET level
Molten impure copper containing cuprous oxide is stirred with green wood poles. The refining method is called NEET level
In the Mond process the volatile carbonyl is formed and decomposed respectively at about JEE Main level
Which statement about the Parkes process is correct? JEE Main level
In the electrolytic refining of copper, the anode impurities behave as follows: JEE Main level
Match the refining method in List I with the application in List II. List I: (A) Zone refining; (B) Mond process; (C) Poling; (D) Parkes process. List II: (p) N... JEE Main level
Assertion (A): Van Arkel refining removes oxygen and nitrogen impurities from crude titanium. Reason (R): Oxygen and nitrogen impurities do not form volatile io... JEE Main level
In zone refining, the distribution coefficient of an impurity is defined as k = C_solid/C_liquid. For an impurity with k < 1, the impurity ends up JEE Main level
Electrolytic refining of copper uses acidified copper sulfate solution as electrolyte. Sulfuric acid is added mainly to JEE Main level
The compound Ni(CO)4 formed in the Mond process has which of the following properties? JEE Main level
Refining methods that depend on conversion of the metal into a volatile compound followed by its decomposition are JEE Main level
In the Hoope's three-layer electrolytic process for aluminium, the top layer consists of JEE Main level
Column chromatography separates the components of a mixture mainly because JEE Main level
A 295 g sample of crude nickel contains 80.0% Ni by mass, the rest being non-reacting impurity. It is treated with excess CO in the Mond process, and all the ni... JEE Advanced level
An impure copper anode of mass 800 g contains 95.0% Cu, 2.60% Zn, 1.40% Fe and 1.00% of Ag and Au (by mass). It is dissolved completely in acidified CuSO4 elect... JEE Advanced level
In a Parkes process, 2000 kg of molten lead contains 0.0300% silver by mass (600 g of Ag). Molten zinc (10.0 kg) is stirred in once and allowed to separate. At ... JEE Advanced level
During electrolytic refining of copper, the anode contains Cu with Zn, Ag and Au impurities. Given E deg(Zn^2+/Zn) = -0.76 V, E deg(Cu^2+/Cu) = +0.34 V, E deg(A... JEE Advanced level
In the van Arkel process, Ti(s) + 2I2(g) -> TiI4(g) has Delta H deg = -285.0 kJ and Delta S deg = -162.5 J K^-1 (assume both independent of temperature). The te... JEE Advanced level
For Ni(s) + 4CO(g) -> Ni(CO)4(g), take Delta H deg = -161.0 kJ mol^-1 and Delta S deg = -396 J K^-1 mol^-1, independent of temperature. The values of Delta G de... JEE Advanced level
Zone refining of germanium is carried out on a rod with a heater that moves from the left end to the right end. Let k = C_solid/C_liquid for an impurity. Which ... JEE Advanced level
A 94.0 g sample of nickel(II) oxide ore (80.0% NiO by mass, impurities inert) is reduced completely by CO to nickel, NiO + CO -> Ni + CO2. The crude nickel is t... JEE Advanced level
For a metal to be refined by a vapour-phase (Mond or van Arkel type) method, which conditions must hold? JEE Advanced level
A 2.50 kg impure copper anode contains 96.0% Cu, 1.80% Zn, 0.65% Ni and the rest Ag and Au. It is dissolved completely at the anode and the same charge is passe... JEE Advanced level
1200 g of crude zirconium containing 95.0% Zr (rest oxide and nitride impurities that do not react with iodine) is heated with iodine in the van Arkel process, ... JEE Advanced level