37. Which one of the following complexes displays lowest water exchange rate? (A) [Cr(H₂O)₆]³⁺ (B) [Mn(H₂O)₆]²⁺ (C) [Ni(H₂O)₆]²⁺ (D) [Cu(H₂O)₆]²⁺ (E) [Zn(H₂O)₆]²⁺

6. Which one of the following functions is the wave function of a sp hybridized orbital of an atom? (A) (1/2)1/2(ψ(s) + ψ(p)) (B) (1/3)1/2ψ(s) - (1/6)1/2ψ(px) + (1/2)1/2ψ(py) (C) (1/3)1/2ψ(s) - (1/6)1/2ψ(px) - (1/2)1/2ψ(py) (D) (1/2)(ψ(s) + ψ(px) + ψ(py) + ψ(pz)) (E) (1/2)(ψ(s) + ψ(px) - ψ(py) - ψ(pz))