Statement I : Leaching of gold with cyanide ion in absence of air / O₂ leads to cyano complex of Au(III).

Statement II : Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, choose the correct answer from the options given below.

The correct order of increasing intermolecular hydrogen bond strength is

The correct order of increasing ionic radii is

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is :