What is the general formula for hydrides?

The correct answer is based on the definition of hydrides, which are compounds formed between hydrogen and another element, typically a metal. In the general formula represented by "Me + H", "Me" stands for a metal, and the "+" indicates that it is combined with hydrogen.

Hydrides can be categorized into different types, such as ionic hydrides, covalent hydrides, and metallic hydrides, depending on the nature of the bond formed between hydrogen and the metal. For instance, alkali and alkaline earth metals form ionic hydrides where hydrogen acts as a negative ion, while non-metals can form covalent hydrides.

To further clarify, the context of the other choices makes it evident that they do not represent hydrides. "Me + O" refers to oxides, compounds formed with oxygen; "Me + Cl" relates to chlorides, which are compounds with chlorine; and "Me + OH" signifies hydroxides, involving the hydroxide ion. Each of these options represents different classes of chemical compounds and not hydrides, which underscores why "Me + H" is the appropriate choice.