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(I) Discuss the three types of Covalent hydrides? (II) Write the chemical reactions to show the amphoteric nature of water? |
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Answer» (I) 1. They are the compounds in which hydrogen is attached to another element by sharing of electrons. 2. The most common examples of covalent hydrides are methane, ammonia, waterand hydrogen chloride. 3. Molecular hydrides of hydrogen are further classified into three categories as,
4. Since most of the covalent hydrides consist of discrete, small molecules that have relatively weak intermolecular forces, they are generally gases or volatile liquids. (II) Water is amphotenc in nature and it behaves both as an acid as well as base. With acids stronger than itself (e.g., H2S) it behaves as a base and with bases stronger than itself (e.g., NH3) it acts as an acid. 1. As a base: H2O(l) + H2S(aq) → H3O(aq) – HS-(aq) 2. As a acid: H2O(l) + NH3(aq) → OH-(aq) + NH+ |
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