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Date: 25-11-2018
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Date: 30-3-2019
925
Date: 1-4-2019
1225
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Oxides of Ga, In and Tl
The oxides and related compounds of the heavier group 13 metals call for less attention than those of Al. Gallium, like Al, forms more than one polymorph of Ga2O3, GaO(OH) and Ga(OH)3, and the compounds are amphoteric. This contrasts with the basic nature of In2O3, InO(OH) and In(OH)3. Thallium is unique among the group in exhibiting an oxide for the M(I) state: Tl2O forms when Tl2CO3 is heated in N2, and reacts with water.
Thallium(III) forms the oxide Tl2O3, but no simple hydroxide. Tl2O3 is insoluble in water and decomposes in acids. In concentrated NaOH solution and in the presence of Ba(OH)2, the hydrated oxide Tl2O3.xH2O forms Ba2[Tl(OH)6]OH. In the solid state, the [Tl(OH)6]3- ions are connected to Ba2+ and [OH]- ions to give a structure that is related to that of K2PtCl6 .
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تفوقت في الاختبار على الجميع.. فاكهة "خارقة" في عالم التغذية
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أمين عام أوبك: النفط الخام والغاز الطبيعي "هبة من الله"
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قسم شؤون المعارف ينظم دورة عن آليات عمل الفهارس الفنية للموسوعات والكتب لملاكاته
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