Litmus is colored red by solutions that have an acidic medium, for example, acid solutions. Acids, in turn, can be formed by the interaction of acidic oxide with water.
Thus, this description is satisfied:
carbon monoxide (IV) (carbon dioxide): CO2 + H2O = H2CO3
sulfur (IV) oxide (sulfur dioxide): SO2 + H2O = H2SO3
nitric oxide (IV) (brown gas): 2NO2 + H2O = HNO3 + HNO2
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.