Ethanoic acid (vinegar) is commonly used for cooking.

Acids can be corrosive and must be handled with care.

Acids turn red litmus paper blue.

Alkalis belong to a larger class of chemicals called bases.

Alkalis are used for making soaps.

Ammonia is a corrosive alkali.

Lemons and oranges taste sour due to the presence of nitric acid.

The diagram shows what happens when red and blue litmus papers are dipped in Solution X.

Which of the following substances could possible be solution X?