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प्रश्न
Discuss the trend of the following:
The solubility and the nature of oxides of Group 2 elements.
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उत्तर
All the alkaline earth metals form oxides of formula MO. The oxides are very stable due to high lattice energy and are used as refractory material. Except BeO (predominantly covalent), all other oxides are ionic and their lattice energy decreases as the size of cation increases.
The oxides are basic and basic nature increases from BeO to BaO (due to increasing ionic nature).
`ubrace(BeO <)_("Amphoteric") ubrace(MgO <)_("Weakly basic") ubrace(CaO < SrO < BaO)_("Strongly basic")`
BeO dissolves both in acid and alkalies to give salts and is amphoteric.
The oxides of the alkaline earth metals (except BeO and MgO) dissolve in water to form basic hydroxides and evolve a large amount of heat. BeO and MgO possess high lattice energy and thus are insoluble in water.
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संबंधित प्रश्न
Discuss the general characteristics and gradation in properties of alkaline earth metals.
Assertion: BeSO4 is soluble in water while BaSO4 is not
Reason: Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
In context with beryllium, which one of the following statements is incorrect?
Write a balanced chemical equation for the following chemical reaction.
Rubidium with oxygen gas
Discuss briefly the similarities between beryllium and aluminium.
Explain the important common features of Group 2 elements.
Why alkaline earth metals are harder than alkali metals?
Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is ______.
When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to ______.
Name an element from Group 2 which forms an amphoteric oxide and a water soluble sulphate.
Discuss the trend of the following:
Thermal stability of carbonates of Group 2 elements.
Why are BeSO4 and MgSO4 readily soluble in water while CaSO4, SrSO4 and BaSO4 are insoluble?
What is the structure of BeCl2 molecule in gaseous and solid state?
Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide.
Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is ______.
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is ______.
MgBr2 and Mgl2 are soluble in acetone because of ______.
PbCl4 exists but PbBr4 and Pbl4 do not because of ______.
