$7.$ Consider the following sets of compounds. For each, order the species according to the property listed $($always Most to Least$).$ You MUST provide a brief explanation for the ordering:

$($a$)$ Strongest Acid:

$($i$)P{H}_3$

$($ii$)Si{H}_4$

$($iii$)H_{2}Te$

$($iv$)H_{2}S$

$($b$)$ Most acidic solution

$($i$)B{a}^{2+}(aq)$

$($ii$)M{o}^{3+}(aq)$

$($ii$)M{o}^{2+}(aq)$

$($iv$)S{r}^{2+}$

$($c$)$ Most Basic ion:

$($i$)N{H}_2^{-}$

$($ii$)Se{H}^{-}$

$($iii$)P{H}_2^{-}$

$($iv$)C{l}^{-}$

$($d$)$ Most Basic Oxide

$($i$)Si{O}_2$

$($ii$)C{O}_2$

$($iii$)$ MgO

$($iv$)$ CaO