NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice
Which of the following statements about anhydrous aluminium chloride is correct?
Options
- Ait sublimes at 100 o C under vacuum
- Bit exists as A l C l 3 molecules
- Cit is a strong Lewis base
- Dit is not easily hydrolysed
Correct answer
A. it sublimes at 100 o C under vacuum
Step-by-step solution
A l C l 3 exists as a dimmer ( A l 2 C l 6 ) . It is a strong Lewis acid as Al has an incomplete octet and has a tendency to gain electrons. A l C l 3 undergoes hydrolysis easily and forms an acidic solution. A l C l 3 + 3 H 2 O → A l ( O H ) 3 + 3 H C l i.e., A l C l 3 sublimes at 100oC under vaccum.