Which of the following trend is/are corr...

Which of the following trend is/are correct?

`Na lt K lt Rb`

`I ^(+) lt I ^(-) lt I`

`Fe ^(2+) lt Fe ^(2+) lt Fe`

`F lt O lt N`

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The correct Answer is:

B, C

`C lt N gt O, F ^(-) gt Na ^(+) gt Mg ^(2+)`

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