Question 1:

Which of the following is an example of an acid-base indicator?

Explanation: Phenolphthalein is an example of an acid-base indicator. It changes color depending on the pH of the solution, making it useful for detecting the endpoint of acid-base titrations.

Question 2:

Which color indicates the presence of an acid in the presence of bromothymol blue indicator?

Explanation: Bromothymol blue turns yellow in the presence of an acid. It is commonly used as an indicator to distinguish between acidic and basic solutions.

Question 3:

Which of the following indicators is commonly used in titrations of strong acids and strong bases?

Explanation: Phenolphthalein is commonly used in titrations of strong acids and strong bases. It undergoes a color change from colorless to pink or magenta in the pH range of 8.2 to 10.0, making it suitable for detecting the endpoint of neutralization reactions.

Question 4:

Which of the following indicators is suitable for determining the endpoint of a titration between a weak acid and a strong base?

Explanation: Phenolphthalein is suitable for determining the endpoint of a titration between a weak acid and a strong base. It changes color in the pH range of 8.2 to 10.0, making it useful for detecting the point at which the acid and base have completely reacted.

Question 5:

What color does litmus paper turn in the presence of an acidic solution?

Explanation: Litmus paper turns red in the presence of an acidic solution. It is a commonly used indicator that can help distinguish between acidic and basic substances.