Acid-Base Indicators - Exam
- 1. What color does phenolphthalein turn in acidic solutions?
A) Blue
B) Yellow
C) Red
D) Colorless
- 2. What color does methyl orange turn in an acidic solution?
A) Green
B) Colorless
C) Blue
D) Red
- 3. What color does litmus turn in a basic solution?
A) Yellow
B) Green
C) Red
D) Blue
- 4. What color does phenolphthalein turn in basic solutions?
A) Blue
B) Green
C) Pink
D) Yellow
- 5. Which indicator is colorless in acidic solutions and pink in basic solutions?
A) Methyl orange
B) Phenolphthalein
C) Litmus
D) Bromothymol blue
- 6. Methyl orange turns from red to _____ as the solution becomes more basic.
A) Red
B) Blue
C) Yellow
D) Green
- 7. Which indicator is often used in qualitative analysis to determine whether a solution is acidic or basic?
A) Bromothymol blue
B) Methyl orange
C) Litmus
D) Phenolphthalein
- 8. What is the color of litmus in a neutral solution?
A) Purple
B) Yellow
C) Red
D) Blue
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