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What are pH indicators? 


Options:
A .   Aqueous solution of either salts of strong acids or strong bases.
B .   Aqueous solution either salts of weak acids or weak bases.
C .   Aqueous solution of either weak acids or weak bases.
D .   Aqueous solution of either strong acids or strong bases.
Answer: Option C
:
C

pH indicators are aqueous solutions of either weak acids or weak bases. They are chemical detectors of hydrogen ions (H+1) and hydroxide ions (OH−1) . It is added in small quantity to a solution to determine the pH.


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