Q58) Consider the following statements about acid-base indicators.
i) Phenolphthalein gives a pink colour if the solution is acidic.
ii) China rose indicator turns acidic solutions to dark pink.
iii) Blue litmus turns red for a basic solution.
Which of the above statements are true?
Q58) Consider the following statements about acid-base indicators.
i) Phenolphthalein gives a pink colour if the solution is acidic.
ii) China rose indicator turns acidic solutions to dark pink.
iii) Blue litmus turns red for a basic solution.
Which of the above statements are true?
The correct option is A a) ii only
A) Explanation:
Phenolphthalein Test: Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colourless in acidic solutions and pink in basic solutions.
China rose solution gives dark pink (magenta) colour with acid and green colour with base.
Litmus Test: The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions.
a) ii only
A)
Explanation:
Phenolphthalein Test: Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colourless in acidic solutions and pink in basic solutions.
China rose solution gives dark pink (magenta) colour with acid and green colour with base.
Litmus Test: The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions.
