NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice
Which of the following are not more basic than A l O H 3 ?
Options
- AC a O H 2 , C e O H 3
- BY b O H 3 , L u O H 3
- CB O H 3 , B e O H 2
- DC e O H 3 , L u O H 3 .
Correct answer
C. B O H 3 , B e O H 2
Step-by-step solution
The basic strength of the hydroxides decreases as we move from cerium to lutetium Also the lanthanoid hydroxides are more basic than A l O H 3 but less basic than C a O H 2 . B O H 3 is more covalent than A l O H 3 . B e O H 2 is as covalent as A l O H 3 . B O H 3 is acidic while B e O H 2 and A I O H 3 are amphoteric while all others are more basic than A I O H 3 . Hence choice B is correct while A , B a n d D are incorrect.