Which of the following substances enters our body when a red ant bites us?

Write the chemical names of two salts belonging to the sodium family.

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?

Match the important chemicals given in Column $(A)$ with the chemical formulae given in Column $(B)$.

Column $(A)$	Column $(B)$
$(a)$ Plaster of Paris	$(i)$ $Ca(OH)_{2}$
$(b)$ Gypsum	$(ii)$ $CaSO_{4} \cdot 1/2 H_{2}O$
$(c)$ Bleaching Powder	$(iii)$ $CaSO_{4} \cdot 2H_{2}O$
$(d)$ Slaked Lime	$(iv)$ $CaOCl_{2}$

What is the approximate $pH$ value for a solution,if $pH$ paper turns pink when dipped into it?

The concentration of $H_{3}O^{+}$ in $1\,M\,H_{2}SO_{4}$ aqueous solution is $.......$ (in $,M$)