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State whether the following are ionic or...

State whether the following are ionic or covalent
(a) `CaH_(2)` (b) `MgO` (c ) `Na_(2)CO_(3)` (d) `NH_(4)CI`
(e) `HCI` (f) `CaCI_(2)` (g) `Na_(2)S`(h) `SnCI_(2)`
(i) Diamond (j) `CaC_(2)` (k) `NaH` (i) `C_(2)H_(2)` .

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