A) sample 'A' is basic
B) sample 'B' is acidic
C) (ii) observation confirms neutralisation
D) All the above are correct
Correct Answer: D
Solution :Phenolphthalein gives a pink colour with basic solution so sample 'A' is basic. Sample 'A' and 'B' react to give neutralization reaction which is exothermic (evolution of heat) so solution 'B' is acidic.
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