1.

Fe^(3+)overset(SCN^(-)(excess))to "blood red"(A)overset(F^(-)(excess))to"colourless"(B)Identify A and B (a) Write IUPAC name of A and B (b) Find out spin only magnetic moment of B.

Answer»

Solution :`Fe^(3+)unerset(excess)(SCN)^(-)overset(aqueous)tounderset((A)"(blood RED))[Fe(SCN)(H_(2)O)_(5)]]^(2+)``unerset((A)("blood red"))([Fe(SCN)(H_(2)O)_(5)]^(2+))
`unerset(excess)(6F^(-))tounerset((B)("colour LESS")([FeF_(6)]^(3-))+SCN^(-)+5H_(2)O`
(a) Pentaaquathiocyanatoiron (III)ion
hexafluoroferrate (III) (b) Magnetic moment = SQRT(n(n+2)) = sqrt35 = 5.92 B.M., where n = number of UNPAIRED electrons which is equal to 5 here.


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