The mixture only cools down

PCl₃ and HCl are formed and the mixture warms up

PCl₅ and HCl are formed and the mixture cools down

PH₃.Cl₂ is formed with warming up

A change in the partial pressure of oxygen in the air

An interaction with water vapours contained in the humid air

A change in the crystalline structure of tin

An interaction with nitrogen of the air at very low temperatures

HClO₃ and Cl₂O

HClO₂ and HClO₄

HCl and Cl₂O

HCl and HClO₃

The bleaching action of SO₂

The formation of HI

The formation of iodic acid

The formation of sulphur and sulphuric acid

N < P < As < Sb < Bi

Bi < Sb < As < P < N

N < P < Sb < Bi < As

As < P ∼ N ∼ Sb < Bi