The correct option is A 0.2 mol
The given balanced equation is, H2SO4+Ca(OH)2→CaSO4+2H2O
1 mol of H2SO4 reacts with 1 mol of Ca(OH)2 to give 1 mol of CaSO4.
The amount of H2SO4=0.5 mol
The amount of Ca(OH)2=0.2 mol
Thus Ca(OH)2 is the limiting reagent.
Hence, the maximum number of moles of CaSO4 formed in the reaction is 0.2 mol.