Among the following oxides, which is lea...

Among the following oxides, which is least acidic ?

`Al_(2)O_(3)`

`B_(2)O_(3)`

`CO_(2)`

`NO_(2)`

Text Solution

Verified by Experts

The correct Answer is:

Applying Fajans' rule, the higher the oxidation state (or charge), the more is the covalent character and the more is acidic and vice versa. Moreover, the acidic character increases from `B` to `F`.
Acidic character order is
`overset(+4)(NO_(2)) gt overset(+4)(CO_(2)) gt overset(+3)(B_(2)O_(3)) gt overset(+3)(Al_(2)O_(3))(("least acidic"),("or amphoteric"))`
`{:("Period" .rArr,2nd,2nd,2nd,3rd),("Group" .rArr,15,14,13,13):}`

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Among the following, which is least acidic ?

p-nitrophenol

p-Chlorophenol

Phenol

o-Cresol

Which of the following oxide is least acidic

`P_(4)O_(6)`

`P_(4)O_(10)`

`As_(4)O_(6)`

`As_(4)O_(19)`

Among the following which is the least basic

`F^(-)`

`I^(-)`

`CI^(-)`

`Br^(-)`