Answer:

Heat conductivity and electrical conductivity of metal hydrides are quite high, while the conductivity and electrical conductivity of molecular hydrides are extremely low. Metallic hydrides are found in the solid form, whereas molecular hydrides are found in the liquid state and are comparatively soft and volatile. Molecular hydrides are formed by the combination of an element which is having comparable higher electronegativity with hydrogen. Eg. H₂O, B₂H₆