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Among the following oxides, which is lea...

Among the following oxides, which is least acidic ?

A

`Al_(2)O_(3)`

B

`B_(2)O_(3)`

C

`CO_(2)`

D

`NO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
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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Knowledge Check

  • Among the following, which is least acidic ?

    A
    p-nitrophenol
    B
    p-Chlorophenol
    C
    Phenol
    D
    o-Cresol

  • Which of the following oxide is least acidic

    A
    `P_(4)O_(6)`
    B
    `P_(4)O_(10)`
    C
    `As_(4)O_(6)`
    D
    `As_(4)O_(19)`

  • Among the following which is the least basic

    A
    `F^(-)`
    B
    `I^(-)`
    C
    `CI^(-)`
    D
    `Br^(-)`