Hydrides which are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals are called:
Correct answer: B. Ionic hydrides
- A. Covalent hydrides
- B. Ionic hydrides
- C. Complex hydrides
- D. Metallic hydrides
- E. Polymeric hydrides
Explanation
The correct answer is Ionic hydrides. Ionic hydrides are formed when hydrogen gas is passed over hot alkali or alkaline earth metals (except Be and Mg). In this reaction, the metal donates electrons to hydrogen, resulting in a compound with ionic properties. These hydrides are typically white crystalline solids that react with water to release hydrogen gas.Covalent hydrides involve electron sharing with non-metals, which is not the case here. Complex hydrides involve more complex combinations of elements and are not formed by the simple interaction described. Metallic hydrides involve transition metals and are formed by hydrogen absorption into metal lattices, not applicable here. Polymeric hydrides involve hydrogen bonding in networks, not relevant to this reaction.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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