1.

Dihydrogen, under certain reaction conditions, combines with almost all elements, except noble gases, to form binary compounds, called hydrides. If 'E' is the symbol of an element, then hydride can be expressed as EH_x (e.g.HgH_2)or E H_x (e.g. B_2H_6) . The hydrides are classified into three categories : ionic, covalent and metalicIn which of the following pair, both the hydrides are not of the same type

Answer»

`LaH_3, TiH_2`
`CH_4, H_2S`
`NAH, CaH_2`
`BaH_2, SiH_4`

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