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The cyanide process of gold extraction involves leaching out gold from its ore with \( \mathrm{CN}^{-} \)in the presence of \( \mathrm{Q} \) in
\( \mathrm{P} \) water to form \( \mathbf{R} \). Subsequently, \( \mathbf{R} \) is treated with \( \mathbf{T} \) to obtain

W Au and \( \mathbf{Z} \). Choose the correct option(s).
[JEE Advanced - 2019]
(a) \( \mathrm{T} \) is \( \mathrm{Zn} \)
(b) \( \mathrm{R} \) is \( \left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{-} \)
(c) \( \mathbf{Z} \) is \( \left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-} \)
(d) \( \mathrm{Q} \) is \( \mathrm{O}_{2} \)
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