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Question

Compounds of which of the following transition elements do not exhibit an oxidation state of +3?

A
Ti
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B
Zr
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C
Cu
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D
None
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Solution

The correct options are
A Ti
B Zr
C Cu
Highest Oxidation State for a Transition metal = Number of Unpaired d-electrons + Two s-orbital electrons
Ti Titanium atomic number 22=[Ar]4s23d2. Oxidation state =+4
Zr Zirconium atomic number 40=[Kr]5s24d2. Oxidation state =+4
Cu Copper atomic number 29=[Ar]4s13d10. Oxidation state =+1,+2

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