MCQ
All electrons on the $4p$ sub-shell must be characterized by the quantum number $(s)$
- A$n = 4,\,m = 0,\,s = \pm \frac{1}{2}$
- ✓$l = 1$
- C$l = 0,\,s = \pm \frac{1}{2}$
- D$s = \pm \frac{1}{2}$
$s=\pm 1 / 2$
$l=1 \quad s=0, s=\pm 1 / 2$
$s=\pm 1 / 2$
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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.
