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What is Blue vitriol? Write the effect of heat on it.

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Hint:
NON-STOICHIOMETRIC HYDRIDES:
-These are also known as metallic or interstitial hydrides.
-They are formed by d-block and f-block elements.
-In group 6 of the d block, only chromium forms metallic hydrides.
-Metals of group 7,8,9 do not form hydrides.
-They are known as metallic hydrides as they conduct electricity. They are found mostly in solid-state
-They have a high thermal capacity.

Complete answer:
-Alkali metals do not form this type of hydrides as they do not have variable oxidation states and nor do they have empty valence orbits.
-Alkali metals are highly electropositive in nature and they combine with hydrogen to form ionic hydrides. The alkali metals lose their electrons and transfer it to hydrogen atoms thus due to the transfer of electrons they do not form non-stoichiometric hydrides but form ionic hydrides.
-The elements like Li, Be, Mg do not form ionic hydrides also. The hydrides formed by Be and Mg are polymeric in structure. The ionic hydrides are
white crystalline solids and they have very high melting and boiling point
They are also called saline hydrides.


Note:
 Hydrides: Hydrogen combines with a large number of other elements except noble gases to form binary compounds known as hydrides. There are three types of hydrides.
-Ionic hydrides
-Covalent hydrides:- They are hydrides that are formed by compounds of hydrogen with p-block elements. They are of three types of Electron deficient hydrides, Electron precise hydrides, Electron rich hydrides.
-Non-stoichiometric hydrides.