Explain why water is a Lewis as well as Bronsted base

NH_(3) is a Lewis base as well as Bronsted base. Why?

Water acts as Bronsted acid as well as a Bronsted base. Give one example each to illustrate this statement.

Which is a Lewis base ?

Which of the molecule is/are Lewis base as well as Bronsted acid?

Which of the following compounds/ions can act as bronsted acid as well as a bronsted base?

Which of the following species formed in acid base reactions can act as Bronsted buses as well as Bronsted acids?

Which of the following species can be formed in acid-base reactions as Bronsted base as well as Bronsted acids?

Any species capable of accepting a lone pair of electrons acts as a lewis acid, where as a species capable of donating a proton acts as a Bronstead acid. Which of the following can act as a lewis acid as well as a lewis base ?

Which of the following is the weakest Bronsted base?