At 35^oC, the vapour pressure of CS₂ is 512 mm. Hg and that of acetone is 344 mm Hg. A solution of CS₂ in acetone has a total vapour pressure of 600 mm Hg. The false statement amongst the following is :

The increasing order to P_kb for the following compounds will be :

Oxidation number of potassium in K₂O. K₂O₂ and KO₂ respectively is :

The theory that can completely/properly explain the nature of bonding in [Ni(Co)₄] is :