The property of electrical conductivity is dependent upon the nature of the molecule. Ionic compounds conduct whereas the covalent compounds do not conduct.
BeH2 is a covalent compound and hence do not exhibit conductivity and on the other hand CaH2 is an ionic hydride because of which it conducts in molten or aqueous state. TiH2 is totally metallic in nature and hence it conducts under normal operating conditions.
Hence, the increasing order of electrical conductance is as follows:
BeH2 < CaH2 < TiH2.
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