Which one from the following given statements is true:
(I) Sodium carbonate can be prepared by Solvay process.
(II) Crystals of sodium hydroxide are deliquescent.
(III) NaHCO3 is a mild antiseptic for skin infections.
(IV) Dead burnt plaster is hemihydrate of calcium sulphate.
(V) CaCO3 is used in manufacturing of high quality paper.