When hydrogen reacts with iodine is it balanced or unbalanced?

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this

Pretty sure it's d. heterogeneous is separated by physical properties. 

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m