NCERT Exercise 4.21 - The d- and f-Block Elements
Question: How would you account for the following: (i) Of the d4 species, Cr2+ is strongly reducing while manganese(III) is strongly oxidising. (ii) Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised. (iii) The d1 configuration is very unstable in ions.
Answer: **NCERT answer:** (i) Cr2+ is reducing as it involves change from d4 to d3, the latter is more stable configuration ( 3 ) 2g t Mn(III) to Mn(II) is from 3d4 to 3d5 again 3d5 is an extra stable conf...
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