What is the chemical nature of alane?

Explain: Proton $(H^{+})$ does not exist in aqueous solution.

$A$ sample of water containing some dissolved table sugar and common salt is passed through organic ion exchange resins. The resulting water will be

The temperatures of maximum density in $H_2O$ and $D_2O$ respectively are:

Permanent hardness due to $Mg^{2+}$ ions is best removed by

The major products during the removal of temporary hardness of water are