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NEETChemistryp Block Elements (Group 15, 16, 17 & 18)

Why do some metals like Cr and Al not dissolve in concentrated nitric acid?

Options

  1. ABecause they form passive films of oxide on the surface
  2. BBecause they react violently with the acid
  3. CBecause they are noble metals
  4. DBecause they are insoluble in all acids

Correct answer

A. Because they form passive films of oxide on the surface

Step-by-step solution

The paragraph explains that some metals like Cr and Al do not dissolve in concentrated nitric acid because they form passive films of oxide on the surface.

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