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The d-And-f-Block Elements
Question
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Which of the following species is not paramagnetic

  • NO

  • CO

  • O2

  • B2

Answer

B.

CO

NO ⇒ One unpaired electron is present in π*molecular orbital.
CO ⇒ No unpaired electron is present
O2 ⇒ Two unpaired electrons are present in π* molecular orbitals.
B2 ⇒ Two unpaired electrons are present in π bonding molecular orbitals.

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

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Explain why Cu+ ion is not stable in aqueous solutions?

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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?

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