Advertisements
Advertisements
Question
Discuss briefly the similarities between beryllium and aluminium.
Advertisements
Solution
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.
RELATED QUESTIONS
Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?
Which one of the alkaline earth metal carbonates is thermally the most stable?
The product obtained as a result of a reaction of nitrogen with CaC2 is ______.
Assertion: Generally alkali and alkaline earth metals form superoxides.
Reason: There is a single bond between O and O in superoxides.
Write a balanced chemical equation for the following chemical reaction.
Rubidium with oxygen gas
Explain the important common features of Group 2 elements.
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
What is the structure of BeCl2 molecule in gaseous and solid state?
An element of group 2 forms covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identify the element and write chemical reactions of the hydroxide of the element with an alkali and an acid.
