Hydrogen forms a stoichiometric hydride with which of the following metal

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Lanthanum

Potassium

Titanium

Platinum

answer is B.

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Detailed Solution

Ionic hydrides are also called stoichiometric hydrides. Ionic hydrides are formed by IA & IIA group elements [Except Be, Mg]Exception : BeH2 & MgH2 are covalent hydrides.→ Note : The formula of stoichiometric hydrides corresponds to Oxidation sate of metali.e., They follow valency rules.KH ⇒ K+H-→ La, Ti, Pt hydrides are non-staichiometric hydridesi.e., They do not follow valency rules. The formula of non-stoichiometric hydrides do not corresponding to any normal oxidation state of metal.Eg : VH0.56 , Fe0.93O , TiH1.5-1.8

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