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{:("Column-I", "Column-II"),((A)"Boron "...

`{:("Column-I", "Column-II"),((A)"Boron ",(P)"Vacant orbital in valency shell "),((B)"Phosphorus ",(Q)"Unpaired electron in valency shell "),((C)"Iron ",(R)"Non-metallic properties "),((D)"Calcium",(S)"No unpaired electron "),("",(T)X_(2)O_(3)"type (empirical ratio) oxide formation"):}`

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The correct Answer is:
A-PQRT; B-PQRT; C-PQT; D-PS
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