Which of the following options are correct? (i) Cast iron is obtain...

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Which of the following options are correct?
(i) Cast iron is obtained by remelting pig iron with scrap iron and coke
\( \mathrm{P} \) using hot air blast.

W
(ii) In extraction of silver, silver is extracted as cationic complex.
(iii) Nickel is purified by zone refining.
(iv) \( \mathrm{Zr} \) and \( \mathrm{Ti} \) are purified by van Arkel method.
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