MCQ
Oxide of metal cation which is not amphoteric?
- A$Al^{ 3+}$
- B$Cr^{ 3+}$
- ✓$Fe^{ 3+}$
- D$Zn^{ 2+}$
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The number of following statements which is/are correct about phenolphthalein is $.....$.
$A$. It can be used as an indicator for the titration of weak acid with weak base.
$B$. It begins to change colour at $pH =8.4$
$C$. It is a weak organic base
$D$. It is colourless in acidic medium

$3 s^{2}$; $3 s^{2} 3 p^{1}$; $3 s ^{2} 3 p ^{3}$; $3 s^{2} 3 p^{4}$
The correct order of first ionization enthalpy for them is.