The chemical reactions for the given substances would be as follows:

H2SO4 $sulfuricacid$ + H2 $hydrogengas$ = H2SO4 + H2O

H2 $hydrogengas$ + HCl $hydrochloricacid$ = 2HCl

CuCl2 $copper(II)chloride$ + Cu$OH$2 $copper(II)hydroxide$ = 2CuCl + 2H2O