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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen5 Marks
Question
What are metallic/ interstitial hydrides? How do they differ from molecular hydrides?
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Answer

Metallic hydrides are formed by d- and f-block elements.
Their hydrides conduct heat and electricity.
They are non-stoichiometric, being deficient in hydrogen.
For example, $\mathrm{LaH}_{2.87}, \mathrm{ybH}_{2.55}$ etc.
Metallic hydrides
Molecular hydrides
(1)
These are formed by el­and f-block elements.
(1)
These are formed by p-block elements and some s-block elements (Be and Mg).
(2)
They conduct electricity.
(2)
They do not conduct electricity.
(3)
They are hard and have metallic luster.
(3)
They are volatile compounds having low melting and boiling points.

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