Answer :
a i) 
Fluoride is a weak ligand and it is unable to bind the inner d orbitals. Cobalt ion has 6 electrons in its 3d orbital in which 4 are unpaired. The Flouride ion pair with the 3d electrons by utilising 1 4s, 3 4p and 2 4d electrons for the hybridisation. Thus, the hybridisation is 
.
Shape is Octahedral
IUPAC name is hexafluorocobalt(3-)
ii) 
The electronic configuration of Nickel ion is 
. Each hybrid orbital is occupied by a pair of electrons from each cyanide molecule. Thus, the hybridisation is 
. Shape is Square planar IUPAC name is Tetracyanonickelate(II)
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