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The d-And-f-Block Elements
Question
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Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

  • The common oxidation states of cerium are +3 and +4

  • Cerium (IV) acts as an oxidizing agent

  • The +4 oxidation state of cerium is not known in solutions

  • The +3 oxidation state of cerium is more stable than the +4 oxidation state

Answer

C.

The +4 oxidation state of cerium is not known in solutions

+3 and +4 states are shown by Ce in aqueous solution.

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Some More Questions From The d-And-f-Block Elements Chapter

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

Write the general electronic configuration of d-block elements.

Why do some exceptions to the general electronic configuration of d-block elements exists?