MCQ
Which of the following is the weakest base ?
- A$NaOH$
- B$Ca(OH)_2$
- ✓$NH_4OH$
- D$KOH$
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(Given atomic number: $\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{~V}=23$, $\mathrm{Cr}=24, \mathrm{Mn}=25$ and $\mathrm{Zn}=30)$


which of the following alkyne cannot give ketone
[Molar mass of $\mathrm{KCl}=74.5$ ]
| $ClO_4^{-}$ | $IO_4^{-}$ | $BrO_4^{-}$ |
| $E^{\circ}=1.19 V$ | $E^{\circ}=1.65 V$ | $E^{\circ}=1.74 V$ |
The correct order of their oxidising power is: