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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

1. (1) (c) and (d) only
2. (2) (a), (c) and (d) only
3. (3) (b), (c) and (d) only
4. (4) (a), (b), (c) and (d)

Correct answer: (4) (a), (b), (c) and (d)

Solution

(a) Limestone decomposes to CaO (flux) in the blast furnace - true. (b) Silver is leached as the anionic complex [Ag(CN)2]^- - true. (c) Nickel is purified by Mond's carbonyl process - true. (d) Zr and Ti are purified by the Van Arkel method - true. So all four are correct.

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