Is H20 a strong acid

Answer 1

Not necessarily. You are thinking about a Brønsted-Lowry acid. However acids can be classified under Arrhenius and Lewis classifications as well, with the latter being the most comprehensive. A Lewis acid is a chemical compound that can accept a pair of electrons. Therefore a strong acid may not have to transfer H+ ions to water although many do. A chemical example is AlCl3.

Answer 2

No it's water, which is amphoteric in nature.

Answer 3

H2O (water) is not a strong acid. In fact, water is considered a neutral substance, as it can act as both an acid and a base depending on the context.