Which of the following metals cannot be obtai | vedclass

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(C) Auto-reduction (or self-reduction) is a process used for metals like $Pb$,$Hg$,and $Cu$ where the sulfide ore is partially roasted to form oxide,w

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Titanium

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(C) Auto-reduction (or self-reduction) is a process used for metals like $Pb$,$Hg$,and $Cu$ where the sulfide ore is partially roasted to form oxide,which then reacts with the remaining sulfide to yield the metal. For example,$2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$ followed by $2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2$. Titanium $(Ti)$ is a highly reactive metal and cannot be extracted by auto-reduction. It is typically extracted using the Kroll process,which involves the reduction of $TiCl_4$ with magnesium $(Mg)$ or sodium $(Na)$.

Which of the following metals cannot be obtained by auto-reduction of their compounds?

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