Is the redox method applicable to all chemical reactions?
Sometimes you aren't able to use the redox method to balance a chemical equation. This is because the redox method is only used to balanced an equation where a element gets oxidised or reduced. However if there is a chemical equation where no element is getting oxidised or reduced, then you won't be able to use the redox method to balance the equation. However, fortunately most of the time these type of equations can be easily balanced. Consider the following unbalanced equation: $$\ce{Ba(OH)2.8H2O (s) + NH4SCN (s) -&gt; Ba(SCN)2 (s) +  H2O (l) + NH3 (g)}$$

Here none of the elements are reduced or oxidised, hence you would not be able to balance this equation using the redox method.