$(i)$ What is vinegar? State its one use.
$(ii)$ Which gas is produced when dilute ethanoic acid is added to sodium bicarbonate? How will you test the presence of this gas?

(N/A) $(i)$ $A$ $5-8 \%$ solution of acetic acid in water is known as vinegar. Its use: It is commonly used as a preservative in pickles and various food items.
$(ii)$ When dilute ethanoic acid is added to sodium bicarbonate,carbon dioxide $(CO_2)$ gas is produced. Test: This gas turns lime water milky and extinguishes a burning splinter.