Which of the following elements form metallic hydrides?

Options

A. A They generally form non-stoichiometric species
B. B The hydrogen dissolved in titanium improves its mechanical properties
C. C They give rise to metals fit for fabrication
D. D On thermal decomposition, they afford a source of pure hydrogen

Answer

A

Explanation

The interstitial hydrides are generally non-stoichiometric and their compositions vary with temperature and pressure. For example, `TiH_(1.73), CeH_(2.7), LaH_(2.8)`etc.