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(a) Are the oxidation state and covalency of Al in [AICI(H2O)5]2++ same?(b) Which of the following will have the most negative electron gain enthalpy and which the least negative? P,S, C1, FExplain your answer.(c) Using the Periodic Table, predict the formulas of compounds which might be formed by the following pairs of elements:(i) Si and Br(ii) Al and S |
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Answer» (a) No, the oxidation state of Al is +3 and the covalency is 6. (b) Electron gain enthalpy generally becomes more negative across a period as we more from left to right. Within a group, electron gain enthalpy becomes less negative down a group. However, adding an electron to the 2p-orbital leads to more repulsion than adding an electron to the larger 3p-orbital. Hence, the element with most negative electron gain enthalpy is CI and the one with the least negative electron gain enthalpy is P (c) (i) Si is a group 14 element with a valence of 4; Br belongs to the halogen family with a valence of 1. Therefore, the formula of the compound formed would be SiBr4. (ii) Al belongs to group 13 with a valence of 3, S belong to group 16 elements with valence of 2. Therefore, the formula of the compound formed would be Al2S3. |
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