In which reaction does the oxidation number of oxygen increase?
a. Ba(NO3)2+K2SO4--->BASO4+2KNO3
b. HCL+ NaOH---> NaCl+H20
c. Mg0+ H20---> Mg(OH)2
d. 2SO2+02---> 2SO3
e. 2H2O---> 2H2+O2
d. 2SO2+02---> 2SO3
To identify the reaction in which the oxidation number of oxygen increases, we need to determine the initial and final oxidation numbers of oxygen in each reaction.
a. In the reaction Ba(NO3)2 + K2SO4 ---> BaSO4 + 2KNO3, oxygen is present in NO3 and SO4 ions. In NO3, the oxidation number of oxygen is already -2. In BaSO4, the oxidation number of oxygen is also -2. Hence, the oxidation number of oxygen does not change in this reaction.
b. In the reaction HCl + NaOH ---> NaCl + H2O, oxygen is present in H2O. Here, the oxidation number of oxygen changes from -2 in NaOH to -2 in H2O. Thus, the oxidation number of oxygen does not change in this reaction either.
c. In the reaction Mg + H2O ---> Mg(OH)2, oxygen is present in H2O and Mg(OH)2. In H2O, the oxidation number of oxygen is -2. In Mg(OH)2, the oxidation number of oxygen is also -2. So, the oxidation number of oxygen remains the same.
d. In the reaction 2SO2 + O2 ---> 2SO3, oxygen is present in O2 and SO3. In O2, the oxidation number of oxygen is 0. In SO3, the oxidation number of oxygen is -2. Therefore, the oxidation number of oxygen increases from 0 to -2 in this reaction. Thus, this is the correct answer.
e. In the reaction 2H2O ---> 2H2 + O2, the oxidation number of oxygen changes from -2 in H2O to 0 in O2. So, in this reaction, the oxidation number of oxygen decreases rather than increases.
Therefore, the correct answer is option d. 2SO2 + O2 ---> 2SO3.
In the given reactions, the oxidation number of oxygen increases in the following reaction:
d. 2SO2 + O2 ---> 2SO3
In this reaction, sulfur dioxide (SO2) and oxygen (O2) react to form sulfur trioxide (SO3). Here, the oxidation number of oxygen in SO2 is -2, and in SO3, it is -2. However, in O2, the oxidation number of oxygen is 0. Therefore, the oxidation number of oxygen increases from 0 to -2 in this reaction.