MCQ
Which of the following solutions has the maximum $pH$ value ?
- A$0.2\ M\ HNO_3$
- B$0.2\ M\ HCl$
- C$0.2\ M\ CH_3COOH$
- ✓$0.2\ M\ CH_3COONa$
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Assertion $A$ :Phenolphthalein is a $pH$ dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium
Reason $R$ : Phenolphthalein is a weak acid. It doesn't dissociate in basic medium.
In the light of the above statements, choose the most appropriate answer from the options given below.
$BF _{3}+ NaH \stackrel{450 K }{\longrightarrow} A + NaF$
$A + NMe _{3} \rightarrow B$