Q.
Dihydrogen forms three types of hydrides, $(i)$ hydrides are formed by alkali metals and alkaline earth metals, $(ii)$ hydrides are formed by non-metals and $(iii)$ hydrides are formed by $d$ and $f$-block elements at elevated temperature. Complex metal hydrides such as $(iv)$ and $(v)$ are powerful reducing agents.
(i)
(ii)
(ii)
(iv)
(v)
(a)
Covalent
Molecular
Saline
$NaH$
$LiH$
(b)
Molecular
Covalent
Ionic
$LiAlH_4$
$CaH_2$
(c)
Ionic
Covalent
Interstitial
$LiAlH_4$
$NaBH_4$
(d)
Covalent
Saline
Interstitial
$LiAlH_4$
$NaBH_4$
| (i) | (ii) | (ii) | (iv) | (v) | |
|---|---|---|---|---|---|
| (a) | Covalent | Molecular | Saline | $NaH$ | $LiH$ |
| (b) | Molecular | Covalent | Ionic | $LiAlH_4$ | $CaH_2$ |
| (c) | Ionic | Covalent | Interstitial | $LiAlH_4$ | $NaBH_4$ |
| (d) | Covalent | Saline | Interstitial | $LiAlH_4$ | $NaBH_4$ |
Hydrogen
Solution: