# Solution - General Properties of the Transition Elements (D-block)

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#### Question

Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?

#### Solution

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Write down the number of 3d electrons in each of the following ions:

Ti2+, V2+, Cr3+, Mn2+, Fe2+, Fe3+, CO2+, Ni2+ and Cu2+.

Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

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Give examples and suggest reasons for the following features of the transition metal chemistry:

The highest oxidation state is exhibited in oxoanions of a metal.

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Explain why is Fe3+ more stable than Fe2+?

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Complete the following chemical equations:

(i) Cr_2O_7^(2-)+6Fe^(2+)+14H^+ ->

(ii) 2CrO_4^(2-)+2H^+ ->

(iii) 2MnO_4^-+5C_2O_4^(2-)+16H^+ ->

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Calculate the number of unpaired electrons in the following gaseous ions: Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in aqueous solution?

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#### Reference Material

Solution for concept: General Properties of the Transition Elements (D-block). For the courses 12th CBSE (Arts), 12th CBSE (Commerce), 12th CBSE (Science), PUC Karnataka Science
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