Co2 partial pressure in air above a lake at sea level is 4.0 x 10-4 atm, what is the equilibrium concentration of co2 in the lake at 25oc? (henry’s law constant is 32 l . atm / mole)

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

The answer is b because a,c,and d are opinons