A) \[NaOH\] against oxalic acid
B) Ferrous sulphate against \[KMn{{O}_{4}}\]
C) \[NaOH\] against \[HCl\]
D) \[NaOH\] against \[{{H}_{2}}S{{O}_{4}}\]
Correct Answer: B
Solution :
Phenolphthalein is an indicator for strong base and weak acid, but \[KMn{{O}_{4}}\] oxidises it.
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