What is formed by the reaction of a non-metal oxide with a base?

How is the concentration of a solution expressed in molarity?

Write true or false for the following statement:
Higher is the hydronium ion concentration,higher is the $pH$ value.

Complete and balance the following chemical equations:
$(a)$ $Ca(OH)_{2} + Cl_{2} \longrightarrow$
$(b)$ $CaSO_{4} \cdot 1/2 H_{2}O + H_{2}O \longrightarrow$
$(c)$ $Na_{2}CO_{3} \cdot 10H_{2}O \xrightarrow{\text{air}} \dots$

$(a)$ Why should curd and sour substances not be kept in brass and copper vessels?

Common salt, besides being used in the kitchen, can also be used as the raw material for making:
$(i)$ Washing soda
$(ii)$ Bleaching powder
$(iii)$ Baking soda
$(iv)$ Slaked lime