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Answer
(a).A = Co2+
B = 3
C = d2sp3
D = Paramagnetic
E = sp3
F = tetrahedral
(b). (i) Cr2O72- + 8 H+ + 3 H2S → 2 Cr3+ + 3S + 7 H₂O
(ii) Cr2O72- + 14 H+ 6 Fe2+ 2 Cr³+ + 6 Fe3+ + 7 H₂O
B = 3
C = d2sp3
D = Paramagnetic
E = sp3
F = tetrahedral
(b). (i) Cr2O72- + 8 H+ + 3 H2S → 2 Cr3+ + 3S + 7 H₂O
(ii) Cr2O72- + 14 H+ 6 Fe2+ 2 Cr³+ + 6 Fe3+ + 7 H₂O
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