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

Which of the following metals cannot be obtained by auto-reduction of their compounds?
  1. Lead
  2. Mercury
  3. Titanium
  4. Copper

Solution

Titanium cannot be extracted by reducing the ore using carbon as a cheap reducing agent, like with iron. The problem is that titanium forms a carbide.

Asked in: AP EAMCET 2020 (23 Sep Shift 1)

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