Acidified hydrogen peroxide can: I. Oxidise potassium iodide solution
II. Reduce acidified potassium manganate(VII) solution
ill. Turn green iron(II) sulfate solution yellow

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it