By adding water in `H_(2)SO_(4)` By adding `H_(2)SO_(4)` in water By adding glacial acid in `H_(2)SO_(4)` None of the above
Solution :CONCENTRATED `H_(2)SO_(4)` is diluted by adding the conc. `H_(2)SO_(4)`in the water drop by with constant stirring because it is an exothermic reaction and by doing so HEAT is generated SLOWLY and dissipiated in the ATMOSPHERE.