Explain i For the dilution of 'H2 SO4', water should not be added to conc. 'H2 SO4?' ii Conc. 'H2 SO4', cannot be used for drying 'H2S

Explanation

i Conc: .H_2 SO_4. has .a strong affinity for wa.ter and .a. large ainount of heat is produced on mixing acid with water. The temperature rises suddenly and bumping occurs usually. Thus acid should be added into water slowly with constant stirring to avoid fast temperature rise and bumping.
ii Conc: .H_2 SO_4 on absorbing water gives so much heat that the hydrogen ignites.