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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 5
Total: 49
What may be the stable oxidation state of the transition element withthe following d-electron configurations in the ground state of their atoms :
3d3,3d5,3d8‌and‌3‌d4 ?
Solution:  
(i) 3d3: Stable oxidation state will be +5 due to outer electronicconfiguration 3d34s2(+2, +3, +4, +5).
(ii) 3d5: Stable oxidation state will be +2 and +7 due to outer electronicconfiguration 3d54s2(+2, +3, +4, +6, +7).
(iii) 3d8: Stable oxidation state will be +2 due to outer electronicconfiguration 3d84s2(+2, +3, +4).
(iv) 3d4: Stable oxidation state will be +3 and +6 due to outer electronicconfiguration 3d44s2. There is no d4 configuration in ground state, as itbecomes 3d54s1
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