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Which of the following order is wrong-...

Which of the following order is wrong-

A

`NH_3 lt PH_3 lt AsH_3` - acidic nature

B

`Li^(+) lt Na^(+) lt K^(+) lt Cs^(+)` - ionic radius

C

`Al_2O_3 lt MgO lt Na_2O lt K_2O` - basic

D

`Li lt Be lt B lt C` - 1st ionisation potential

Text Solution

Verified by Experts

The correct Answer is:
D

The ionization potential of `C, B, Be and Li`
`C = 1s^2 , 2s^2 2p^2`

`[C gt Be gt B gt Li]`.
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