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What do you meant by the term hydride? Discuss its different types.

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Hydrides: Dihydrogen combines with almost all elements except noble gases to form binary compounds under certain conditions.

e. g. MgH2, B2H6 etc.

Types of hydrides:

The hydrides are classified into three categories-

(i) Ionic Hydrides:

These are stoichiometric compounds of dihydrogen formed with most of the s-block elements which are highly electropositive in nature. These are also called saline hydrides. e. g NaH, CaH2 etc

(ii) Covalent Hydrides:

These are stoichiometric compounds of dihydrogen formed with most of the p-block elements which have low electropositivity. These are also called molecular hydrides.

eg. CH4, NH3,H2O,HF, etc

(iii) Metallic Hydrides:

These are non-stoichiometric compounds of dihydrogen formed with d-block and f-block elements. However, the metals of group 7, 8 and 9 do not form hydride.

e. g LaH2.55, ZrH1.3−1.75 etc

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