This is an acid-base reaction (neutralization): ZnO is a base, H2SO4 is an acid.
Reactants:
ZnO
Names: Zinc oxide, Zinc white, CalaminePhilosopher's wool, Chinese white, Flowers of zinc, Zinc (as oxide), Zinc paste, Zincum oxydatum, Zinkoxid, Oxyde de zinc, Zinc (as zinc oxide), Zinci oxydum, Óxido de cinc, Zinc(II) oxide, Zinc monoxide, C.I. Pigment White 4, Zinc peroxide
Appearance: White solid ; White powder ; White, odorless solid.
H2SO4 – Sulfuric acid
Other names: Oil of vitriol, Sulfuric acid, concentrated (> 51% and < 100%), H2SO4Sulphuric acid, Battery acid, Hydrogen sulfate, [SO2(OH)2], [S(OH)2O2], Sulfuric acid (aqueous)
Appearance: Clear, colorless liquid ; Odourless colourless oily hygroscopic liquid ; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.]