In \(\left[N i\left(P P h_{3}\right)_{2} C l_{2}\right]\) both the ilgands \(P P h^{3}\) and \(C 1\) are weak and as such cannot pair up the d-electrons. Thus hybridisation is \(s p^{3}\) and shape is tetrahedral.
$A: \left[ Ni ( en )_{3}\right]^{2+}, B :\left[ Ni \left( NH _{3}\right)_{6}\right]^{2+}, C :\left[ Ni \left( H _{2} O \right)_{6}\right]^{2+}$