For the following reactions, equilibrium constants are given :

S(s) + O₂(g) ⇋ SO₂(g); K₁ = 10⁵²

2S(s) + 3O₂(g) ⇋ 2SO₃(g); K₂ = 10¹²⁹

The equilibrium constant for the reaction,

2SO₂(g) + O₂(g) ⇋ 2SO₃(g) is :

The structure of Nylon-6 is :

The ion that has sp³d² hybridization for the central atom, is :

The major product of the following reaction is: