Question

Which of the following substances is most likely to have a pH close to 7?

a) lemon

b) antacid

c) ammonia

Answer 1

A) lemon is the most acidic of the three choices as it has a natural form of acid called Ctric Acid !
Hope this helps
:D

Answer 2

antacid

Step-by-step explanation:

Antacids are substances taken to neutralize hyper acidity of the stomach. Antacids are basic in nature, the most common antacid is calcium carbonate having a pH of about 9.91.

Ammonia has a pH if about 11 under standard conditions while lemon has a pH of about 3 because of it's citric acid content hence the answer above.