Identify the correct statements from the following: i. In the extraction of \(\mathrm{Ag}\) and…
Identify the correct statements from the following:
i. In the extraction of \(\mathrm{Ag}\) and \(\mathrm{Au}\), zinc is used as reducing agent.
ii. Impure zinc can be refined by distillation method.
iii. Malachite is an ore of nickel.
i, ii, iii
i, iii only
ii, iii only
i, ii only
Solution
The explanations of given statements are as follows:
(i) In the extraction of \(\mathrm{Ag}\) and \(\mathrm{Au}\), zinc is used as reducing agent.
\(\begin{array}{r}
2\left[\mathrm{Ag}(\mathrm{CN})_2\right](a q)+\mathrm{Zn}(s) \longrightarrow 2 \mathrm{Ag}(s)+{\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}(a q)}
\end{array}\)
Thus, statement (i) is correct.
(ii) Impure zinc can be refined by the process of distillation.
Thus, statement (ii) is correct.
(iii) Malachite, \(\left[\mathrm{Cu}_2\left(\mathrm{CO}_3\right)(\mathrm{OH})_2\right]\) is an ore of copper. Thus, statement (iii) is incorrect. Hence, correct option is (d).