Acid-Base Indicators
Chemistry ⇒ Acids, Bases, and Salts
Acid-Base Indicators starts at 7 and continues till grade 12.
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See sample questions for grade 7
A solution does not change the color of either red or blue litmus paper. What is the nature of the solution?
A solution turns phenolphthalein pink. Is the solution acidic or basic?
A student adds a few drops of universal indicator to a solution and observes a green color. What does this indicate about the solution?
A student adds methyl orange to a solution and observes a red color. What does this indicate about the solution?
A solution does not change the color of either red or blue litmus paper. What is the nature of the solution?
A solution turns phenolphthalein pink. Is the solution acidic or basic?
A student adds a few drops of universal indicator to a solution and observes a green color. What does this indicate about the solution?
A student adds methyl orange to a solution and observes a red color. What does this indicate about the solution?
Which indicator is best for distinguishing between a strong base and a weak base?
(1) Litmus
(2) Universal indicator
(3) Turmeric
(4) Methyl orange
Which indicator is commonly used in titrations involving strong acids and strong bases?
(1) Litmus
(2) Phenolphthalein
(3) Turmeric
(4) Red cabbage juice
Which indicator turns yellow in a basic solution?
(1) Methyl orange
(2) Litmus
(3) Phenolphthalein
(4) Universal indicator
Which indicator would you use to distinguish between a weak acid and a strong acid?
(1) Litmus
(2) Universal indicator
(3) Turmeric
(4) None of these
Fill in the blank: An indicator that is colorless in acid and pink in base is called ______.
Fill in the blank: Methyl orange turns ______ in acidic solutions.
Fill in the blank: Phenolphthalein turns ______ in basic solutions.
Fill in the blank: Red cabbage juice turns ______ in a basic solution.
True or False: All acid-base indicators are synthetic.
True or False: All indicators change color at the same pH value.
True or False: All indicators work in the same pH range.
True or False: Indicators are only used in laboratories.
