Among statements (a) - (d), the correct ones are :
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond's process.
(d) Zr and Ti are purified by Van Arkel method.
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond's process.
(d) Zr and Ti are purified by Van Arkel method.
Show Hint
- (b), (c) and (d) only
- (a), (b), (c) and (d)
- (c) and (d) only
- (a), (c) and (d) only
The Correct Option is B
Solution and Explanation
(b) True: in the cyanide process silver is leached as the anionic complex \(\mathrm{[Ag(CN)_2]^-}\), later reduced by zinc.
(c) True: nickel is purified by the Mond process: \(\mathrm{Ni + 4CO \xrightarrow{330-350\,K} Ni(CO)_4 \xrightarrow{450-470\,K} Ni + 4CO}\).
(d) True: Zr and Ti are refined by the Van Arkel method (volatile iodides decomposed on a hot tungsten filament).
All four statements are correct.
Answer: (2) (a), (b), (c) and (d)
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