MCQ
Alumina is insoluble in water because
- AIt is a covalent compound
- ✓It has high lattice energy and low heat of hydration
- CIt has low lattice energy and high heat of hydration
- D$Al^{3+}$ and $O^{2-}$ ions are not excessively hydrated
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$S_2O_8^{2-} + 2e^- \longrightarrow 2SO_4^{2-}$
$Mn^{2+} + 4H_2O \longrightarrow MnO_4 + 8H^+ + 5e^-$
How many moles of $S_2O_8^{2-}$ are required to oxidise $1\, mole$ of $Mn^{ 2+}$ ?
[Atomic mass $: \mathrm{Na}=23.0, \mathrm{O}=16.0, \mathrm{H}=1.0]$