Iron, #"Fe"# and lead, #"Pb"#, are metals that do not react with water as long as air is not present. Even then, they would react with the water and air to form new compounds, but they would not dissolve.
Nitrogen, #"N"_2"#, and nitric oxide, #"NO"# are non-polar gases that are somewhat soluble in water, which is polar. The solubility of gases are related to temperature. There is an inverse relationship between temperature and solubility, so that at lower temperatures, a gas is more soluble, and at higher temperatures a gas is less soluble.
Solubility of #"N"_2"# and #"NO"# gas in water.
#"N"_2"#
Solubility at #"0"^("o")"C"# is #"0.0030g/100mL H"_2"O"#.
Solubility at #"20"^("o")"C"# is #"0.0020g/100mL H"_2"O"#.
http://chemwiki.ucdavis.edu/Physical_Chemistry/Equilibria/Solubilty/Temperature_Effects_on_the_Solubility_of_Gases
#"NO"#
Solubility at #"0"^("o")"C"# is #"0.0098g/100mL H"_2"O"#.
Solubility at #"20"^("o")"C"# is #"0.0056g/100mL H"_2"O"#.
http://en.wikipedia.org/wiki/Nitric_oxide
Compare these solubilities to that of sodium chloride in water, which is #"35.9g/100mL H"_2"O"#.
http://en.wikipedia.org/wiki/Sodium_chloride
