(D) The Mond process is used for the refining of nickel $(Ni)$ based on the principle of formation of a volatile carbonyl complex.The chemical reactio

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(D) The Mond process is used for the refining of nickel $(Ni)$ based on the principle of formation of a volatile carbonyl complex.The chemical reactions involved are:$\mathop {Ni}\limits_{\text{impure}} + 4CO_{(g)} \xrightarrow{330-350 \ K} Ni(CO)_{4(g)}$$Ni(CO)_{4(g)} \xrightarrow{450-470 \ K} \mathop {Ni_{(s)}}\limits_{\text{pure}} + 4CO_{(g)}$