Question 1:
Which of the following is an example of an acid-base indicator?
Explanation: The correct answer is D) All of the above. Litmus paper, bromothymol blue, and phenolphthalein are all examples of acid-base indicators. They change color in response to changes in pH and are used to determine whether a substance is acidic or basic.
Question 2:
What color does litmus paper turn in the presence of an acid?
Explanation: The correct answer is B) Red. Litmus paper turns red in the presence of an acid. It remains blue in the presence of a base. Litmus paper is a natural pH indicator derived from lichens.
Question 3:
Phenolphthalein is commonly used as an indicator in:
Explanation: The correct answer is D) All of the above. Phenolphthalein is commonly used as an indicator in both strong acids, weak acids, and strong bases. It remains colorless in acidic solutions and turns pink in basic solutions.
Question 4:
Bromothymol blue turns __________ in the presence of an acid.
Explanation: The correct answer is C) Yellow. Bromothymol blue turns yellow in the presence of an acid. It turns blue in basic solutions. The color change occurs around a pH of 6, making it useful for distinguishing between acidic and neutral solutions.
Question 5:
Which acid-base indicator is commonly used in the titration of a strong acid with a strong base?
Explanation: The correct answer is D) Methyl orange. Methyl orange is commonly used as an indicator in the titration of a strong acid with a strong base. It turns from red in acidic solutions to yellow in basic solutions, with the color change occurring around a pH of 4.5.
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