Chemistry
Chemistry
Problem
Consider the following metallurgical processes : (I) Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. ) and finally decomposition at to get the pure metal (II) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide (III) Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and NaCl to obtain the metal The processes used for obtaining magnesium, nickel and copper are respectively : a. (I), (II) and (III) b. (II), (III) and (I) c. (III), (I) and (II) d. (II), (I) and (III)Intuitive explanation
This problem asks you to match three purification or extraction methods to three metals by recognizing the distinctive chemistry of each process. The key is identifying which metal forms a volatile carbonyl, which one undergoes the self-reduction of its oxide by its own sulfide, and which one is best obtained by electrolysis of a chloride melt. Think about the thermal stability and reactivity patterns of each metal's compounds—nickel's famous carbonyl chemistry, copper's classic roasting-reduction cycle, and magnesium's strong affinity for chloride electrolysis will each point to exactly one process.
Intuitive explanation
This problem asks you to match three purification or extraction methods to three metals by recognizing the distinctive chemistry of each process. The key is identifying which metal forms a volatile carbonyl, which one undergoes the self-reduction of its oxide by its own sulfide, and which one is best obtained by electrolysis of a chloride melt. Think about the thermal stability and reactivity patterns of each metal's compounds—nickel's famous carbonyl chemistry, copper's classic roasting-reduction cycle, and magnesium's strong affinity for chloride electrolysis will each point to exactly one process.