Which of the following molecules is optically active? (a)  [NiCl 3 Br] -1 (b)  [Co(CN)(NH 3 ) 2 Br] +1 (c)  [TiBr(H 2 O)Cl(CN)] +1 (d)  [Co(en)Cl 2 ] (e)  [Cr(NH 3 ) 6 ] 2+ A d 6 ion, (Fe 2+ ), is complexed with six strong field ligands. What is the number of unpaired electrons in this complex ion. (a)  0 (b)  1 (c)  2 (d)  3 (e)  4 (f)  5 Which statement is false. (a) The PO43- ion has 4 resonance structures (b) If a molecule has lone pairs on the central atom it has a net dipole. (c) A complex ion with high field ligands will have a low total spin. (d) No scientific theory can ever be proved. (e) In the conventional periodic table all but the first period lengths repeat.