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Published on: 25/06/2021
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Questions + Answers key
Take MCQ Chemistry Test1.
Beryllium halide are covalent. Explain why?
2.
How does (i) solubility, (ii) thermal stability, (iii) basic character hydroxides of group 2 elements very down the group.
3.
How does the basic nature of the oxides of group 2 elements vary down the group?
4.
How is BeH2 obtained?
5.
Give methods of preparation of beryllium chloride.
1.
Due to the smaller size of Be+2 ion, it polarises the halide ion to a greater extent. Hence Beryllium halides are covalent.
2.
All the properties increase down the group.
Be(OH)2 < Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2
3.
The basic nature of oxides increases down the group.
BeO MgO CaO SrO BaO
amphoteric weak basic strongly basic
4.
BeH2 can be prepared by the reaction of BeCl2 with LiAIH4. (Lithium aluminium hydride).
2BeCl2 + LiAlH4 ⟶ 2BeH2 + LiCl + AlCl3
5.
Thermal decomposition of (NH4)2BeF4 is the best route for the preparation of BeF2. BeCl2 is conveniently made from the oxide.
\(BeO+C+{ Cl }_{ 2 }\overset { 600-800K }{ \rightarrow } BeCl_{ 2 }+CO\).
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