Multiple choice

Which of the following is a soft acid?

  1. Be2+

  2. Mg2+

  3. Ca2+

  4. Cd2+
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because we know that soft acid includes ions of heavier transition metals and those in lower oxidation states which are large sized and their outer orbits are easily distorted. Since cadmium is also from heavier transition metals having outer orbits which are easily distorted due to inert pair effect, it is a soft acid.

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