Read the passage given below and answer the questions that follow :

All neutral halogens are diatomic and readily reduced to halide ions.

All combine with hydrogen to form gases which except for HF, are strong acids in aqueous solution.The chemistry of the halogens is governed in large part by their tendency to acquire an electron to attaina noble gas electron configuration.

Except, fluorine, all halogens disproportionate in sodium hydroxide(dilute) forming halides and hypohalites. All the hypohalite ions are unstable with respect to the disproportionation;

3OX^– → XO₃^–+ 2X^–

Consider the following statements –

(I) Amongst HCl, HBr, HI and HOCl, HCl is most stable to heat.

(II) Chlorine gas is evolved when potassium chlorate reacts with iodine.

(III)The basicity of F^–, Cl^–, Br^–, and I–follows the order F^–> Cl^–> Br^–> I^–

(IV)Sodium hypochlorite is used as bleaching and sterilising agent.Which of the above statements are correct?

Purenitrogen is prepared in the laboratory by heating a mixture of

PH₄I + NaOH forms

PCl₃ reacts with water to form

The gas not absorbed by coconut charcoal is :

P₂O₅ is heated with water to give

Least stable oxide of chlorine is :

Which one has the lowest boiling point ?

When orthophosphoric acid is heated to 600°C, the product formed is

The gas used in air ships is :