Which among the following is non-stoichiometric in nature ?
Methane
Diborane
Nickel Hydride
Ammonia
Nonstoichiometric compounds are chemical compounds deviated from stoichiometry. Their elemental composition cannot be represented by a ratio of well-defined natural numbers, and therefore they violate the law of definite proportions.
d- and f-block elements form non-stochiometric hydrides. Nickel hydride is an example of non-stoichiometric compound. Ionic and covalent hydrides are stoichiometric nature such as etc.