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Solution


Q.

Incorrect statement for the use of indicators in acid–base titration is:             [2023]
1 Methyl orange may be used for a weak acid vs weak base titration.  
2 Phenolphthalein may be used for a strong acid vs strong base titration.  
3 Methyl orange is a suitable indicator for a strong acid vs weak base titration.  
4 Phenolphthalein is a suitable indicator for a weak acid vs strong base titration.  

Ans.

(1)

Methyl orange is suitable indicator for strong acid vs strong base and strong acid vs weak base titration.

Phenolphthalein is suitable indicator for strong acid vs strong base and weak acid vs strong base titration.