How is the concentration of hydronium ions $(H_3O^+)$ affected when a solution of an acid is diluted?

Why does $1 \, M \, HCl$ solution have a higher concentration of $H^{+}$ ions than $1 \, M \, CH_{3}COOH$ solution?

How do metal carbonates and metal hydrogen carbonates react with acids? Give their chemical equations. Name the gas evolved during the reaction. What will happen when this gas is passed through lime water?

What is the effect of an acid on litmus paper?

Match the acids given in Column $(A)$ with their correct source given in Column $(B)$.

Column $(A)$	Column $(B)$
$(a)$ Lactic acid	$(i)$ Tomato
$(b)$ Acetic acid	$(ii)$ Lemon
$(c)$ Citric acid	$(iii)$ Vinegar
$(d)$ Oxalic acid	$(iv)$ Curd

Name the acid present in ant sting and give its chemical formula. Also,suggest a common method to get relief from the discomfort caused by the ant sting.