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Q.
The correct order of increasing electrical conductance is
Hydrogen
Solution:
$BeH_2$ is a covalent hydride. Therefore, it does not conduct electricity. $CaH_2$ is an ionic hydride. Therefore, it conducts electricity in molten state. $TiH_2$ is metallic hydride. Therefore, it is a good conductor of electricity.
$\therefore $ Order of electrical conductance is
$BeH_2 < CaH_2 < TiH_2$