NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- General Principles and Processes of Isolation of Metals
NTA Abhyas 2020 · Chemistry · General Principles and Processes of Isolation of Metals
Consider the following metallurgical processes (I) Heating impure...
Consider the following metallurgical processes
(I) Heating impure metal with CO and distilling the resulting volatile carbonyl (boiling point. ) 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 obtained the metal
The processes used for obtaining magnesium, nickel and copper are respectively
(I) Heating impure metal with CO and distilling the resulting volatile carbonyl (boiling point. ) 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 obtained the metal
The processes used for obtaining magnesium, nickel and copper are respectively
Options
- A(I), (II) and (III)
- B(II), (III) and (I)
- C(III), (I) and (II)
- D(II), (I) and (III)
Correct answer
C. (III), (I) and (II)
Step-by-step solution
(I) + 4CO ↑C{u}_{2}S + \dfrac{3}{2}{O}_{2}\overset{\Delta}{→}C{u}_{2}O + S{O}_{2}C{u}_{2}S + 2C{u}_{2}O\overset{hightemp .}{→}6Cu + S{O}_{2}MgC{l}_{2} \left(s\right)\overset{\text{lectrolysis}}{→}Mg^{2+}\left(l\right) +
At cathode
At anode 2Cl^{-}\left(l\right) \to + 2e^{-}$
At cathode
At anode 2Cl^{-}\left(l\right) \to + 2e^{-}$