1.

incorrect order of lonic size is :-

Answer»

`La^(+3)gt Gd^(+3)gt Eu^(+3)gtLu^(+3)`
`Cegt Prgt Sm gt LU`
`K^(+) lt Sc^(+3)gt V^(+5) gt Mn^(+7)`
`Ti^(+4)l lt Zr^(+4) ~~HF^(+4)`

Answer :A


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