Question 1:

Which of the following substances is likely to have the lowest pH?

Explanation: Lemon juice is acidic in nature and contains citric acid, which gives it a low pH.

Question 2:

A solution with a pH of 9 is considered:

Explanation: A solution with a pH of 9 is considered basic. pH values above 7 indicate basic or alkaline solutions.

Question 3:

Which of the following substances is likely to be the strongest acid?

Explanation: Among the given options, lemon juice is likely to be the strongest acid due to its high concentration of citric acid.

Question 4:

A solution with a pH of 7 is considered:

Explanation: A solution with a pH of 7 is considered neutral. pH 7 is the midpoint on the pH scale.

Question 5:

Which of the following substances is likely to be the strongest base?

Explanation: Ammonia (NH3) is likely to be the strongest base among the given options.