Analytical Chemistry Question 57
Question: Phenolphthalein is not a good indicator for titrating
[NCERT 1977]
Options:
A) $ NaOH $ against oxalic acid
B) Ferrous sulphate against $ KMnO_4 $
C) $ NaOH $ against $ HCl $
D) $ NaOH $ against $ H_2SO_4 $
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Answer:
Correct Answer: B
Solution:
Phenolphthalein is an indicator for strong base and weak acid, but $ KMnO_4 $ oxidises it.
BETA
