Ionic, Covalent and Metallic Hydrides — Prelims Strategy

Prelims Strategy

To tackle NEET questions on hydrides effectively, adopt a multi-pronged strategy. Firstly, master the classification criteria: clearly understand which elements form which type of hydride (Group 1/2 for ionic, p-block for covalent, d/f-block for metallic).

Secondly, memorize key characteristic properties for each type: for ionic, think high melting point, solid, $H^-$ ion, vigorous reaction with water ($H_2$ and base); for covalent, think molecular, variable states, electron-deficient/precise/rich, specific acid/base properties; for metallic, think non-stoichiometric, interstitial, metallic conductivity, hydrogen storage.

Thirdly, pay close attention to exceptions: $BeH_2$ and $MgH_2$ are covalent, not ionic. The 'hydride gap' (Group 7, 8, 9) is crucial. For numerical problems (though rare in this specific subtopic), ensure you can balance reactions involving hydrides.

For conceptual questions, carefully read each option and eliminate distractors based on fundamental principles. Practice identifying the type of hydride from its formula and predicting its behavior.