Answer:
See Explanation
Step-by-step explanation:
The reactivity of a metal towards water depends on the position of the metal in the electrochemical series. Metals that are high up in the series do react violently and spontaneously with water. Metals that are lower in the series are sometimes unreactive in water.
Hence, potassium reacts very rapidly with water to yield KOH and hydrogen gas while gold does not react with water.
SO2 react with water to form sulphuric acid hence SO2 is called an acid anhydride.
The reaction occurs in the following steps;
2SO2(g) + O2(g) ------->2SO3(g)
SO3(g) + H20(l) ------>H2SO4(aq)