An aqueous solution of potassium iodide turns from colourless to brown. What happens to the iodide ions?
A.)lodide ions are oxidised due to gain of electrons
B.)lodide ions are oxidised due to loss of electrons.
C.)lodide ions are reduced due to loss of electrons.
D.)lodide ions are reduced due to gain of electrons.

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .