Chemistry: Hydrogen Hydroxide is more commonly known as what?

Questions

In 1783 George ---------- resigned as US Army's commander-in-chief. ?

In 1790 Jean-Francois Champollion, deciphered ---------- hieroglyphics. ?

In 1805 (USA) Joesph---------- , founder of the Mormon church, born. ?

In 1834 Joseph ---------- of London receives patent for Hansom cabs. ?

In 1920 Ireland divided into two parts, each with its own---------- . ?