1.

Incorrect order of radius is:

Answer»

`Sr^(2+) lt Rb^(+) lt Br^(-) lt Se^(2-)`
`NB^(5+) lt Zr^(4+) lt Y^(3+)`
`Co GT Co^(2+) gt Co^(3+) gt Co^(4+)`
`Ba^(2+) gt Cs^(+) gt Se^(2-) gt As^(3-)`

ANSWER :D


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