A) The hydroxide of aluminium is more acidic than that of boron
B) The hydroxide of boron is basic, while that of aluminium is amphoteric
C) The hydroxide of boron is acidic, while that of aluminium is amphoteric
D) The hydroxide of boron and aluminium are amphoteric
E) None of the above
Correct Answer: C
Solution :
B and Al are the group 13 elements. On moving down the group, the acidic character decreases and the basic character increases. This is because down the group ionisation enthalpy decreases, consequently,\[M-O\] bond weakens and can be easily broken resulting in increased basic strength down the group. Therefore, hydroxides of boron is acidic, Al and Ga are amphoteric while those of In and Tl are basic.
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