Which of the following equations is balanced in an acidic solution?
a. so42- + 2h2o(l) + 2e- so2(g) + 4oh-
b. so42- + 4h+ so2(g) + 4oh- + 2h2o(l)
c. so42- + 2e- so2(g)
d. so42- + 4h+ + 2e- so2(g) + 2h2o(l)

The answer
the only equation which is balanced  in an acidic solution is
D. SO42- + 4H+ + 2e-  SO2(g) + 2H2O(l)
proof:
it is an acid solution because we can see H+, presence of acid in solution
A. SO42- + 2H2O(l) + 2e- SO2(g) + 4OH- 
B. SO42- + 4H+ SO2(g) + 4OH- + 2H2O(l) are basic solution, cause we can observe on these solutions the presence of OH-, 
as for SO42- + 2e- SO2(g)    it is not an acid solution

Answer : option c) heat is released during the process.explanation :

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

Ithink it’s one of those things that you put the object on