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NEETChemistryd and f Block Elements

Why is it difficult to obtain oxidation states greater than two for copper, nickel, and zinc?

Options

  1. AThey have low atomic numbers
  2. BThey have high atomic numbers
  3. CThey have low ionization energies
  4. DThey have high third ionization enthalpies

Correct answer

D. They have high third ionization enthalpies

Step-by-step solution

The high values for third ionization enthalpies of copper, nickel, and zinc indicate why it is difficult to obtain oxidation states greater than two for these elements.

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