1.

Which of the following order is wrong

Answer»

`NH_(3)ltPH_(3)ltAsH_(3)` - acidic nature
`LI^(+)ltNa^(+)ltK^(+)ltCs^(+)`-ionic radius
`Al_(2)O_(3)ltMgOltNa_(2)OltK_(2)O`-BASIC
`LiltBeltBltClt1^(st)` ionisation potential

Answer :D


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