For the reaction Ni2+ + 4NH3 ⇄ [Ni(NH3)4 ]2+ at equilibrium, if the solution contains 1.6 × 10–4% of nickel in the free state, And the concentration of NH3 at equilibrium is 0.5 M. Then the instability constant of the complex will be approximately equal to :
(A) 1.0 × 10–5
(B) 1.5 × 10–16
(C) 1.0 × 10–7
(D) 1.5 × 10–17
