According to the $Brønsted-Lowry$ theory, what kind of substance is a base?

$(i)$ What is meant by the term hydrated salt?
$(ii)$ Give two examples of hydrated salts that are white in color and state their chemical formulas.

In which form do $H^{+}$ (hydrogen) ions exist in water?

Give reasons for the following:
$(i)$ Why is it recommended that acid should be added to water and not water to acid?
$(ii)$ Why do compounds like alcohol and glucose not show acidic behavior even though they contain hydrogen?

Which gas is evolved when dilute hydrochloric acid reacts with zinc? Write the molecular formula of this gas.

What happens when metal oxide reacts with water?