The Bronsted-Lowry acid-base theory was based on which of the following?

Which ions are responsible for the chemical properties of bases in their aqueous solution?

Which of the following is(are) true when $HCl(g)$ is passed through water?
$(i)$ It does not ionise in the solution as it is a covalent compound.
$(ii)$ It ionises in the solution.
$(iii)$ It gives both hydrogen and hydroxyl ion in the solution.
$(iv)$ It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.

Which of the following formulae is correct for calculating the number of moles?

The aqueous solution having $pH \, 11$ is how many times more basic than an aqueous solution having $pH \, 8$?

What is the $H_{3}O^{+}$ ion called?