Advertisements
Advertisements
प्रश्न
Discuss briefly the similarities between beryllium and aluminium.
Advertisements
उत्तर
Diagonal relationship: As observed in alkali metals, beryllium shows a diagonal relationship with aluminium.
Similarities between beryllium and aluminium:
- Beryllium and aluminium have the same electronegativity values.
- Their changes per unit area are closed.
- BeCl2 and AlCl3 forms dimeric structure. Both are soluble in organic solvents and are strong Lewis acids.
- Be(OH)2 and Al(OH)3 dissolves in excess alkali to give beryllate ion [Be(OH)4]2– and aluminate ion [Al(OH)4]–, respectively.
- Be and Al ions have a strong tendency to form complexes, e.g. BeF42– and AlF63–
- Both Be(OFI)2 and Al(OH)3 are amphoteric in nature.
- Carbide of Be – beryllium carbide (Be2C) and Al – aluminium carbide (Al4C3) give methane on hydrolysis.
- Both beryllium and aluminium are rendered passive by nitric acid.
संबंधित प्रश्न
Assertion: Generally alkali and alkaline earth metals form superoxides.
Reason: There is a single bond between O and O in superoxides.
Substantiate Lithium fluoride has the lowest solubility among group one metal fluorides.
Alkaline earth metal (A), belongs to 3rd period reacts with oxygen and nitrogen to form compound (B) and (C) respectively. It undergoes metal displacement reaction with AgNO3 solution to form compound (D). Identify A, B, C and D.
When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to ______.
Identify the correct formula of halides of alkaline earth metals from the following.
(i) BaCl2.2H2O
(ii) BaCl2.4H2O
(iii) CaCl2.6H2O
(iv) SrCl2.4H2O
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?
PbCl4 exists but PbBr4 and Pbl4 do not because of ______.
