Self protective metal among the following is:

Self protective metal among the following is:
  1. Na
  2. Al
  3. Fe
  4. K

Solution

Al when comes in contact with air to form $\mathrm{Al}_{2} \mathrm{O}_{3}$ which forms a protective passive layer on the metal. This layer cannot be removed by chemical means. *

Asked in: JEE-TOPICTESTS-CHEMISTRY

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