An element (X) forms compounds of the fo...

An element `(X)` forms compounds of the formuls `XCl_(3),X_(2)O_(5)` and `Ca_(3)X_(2)` , but does not form `XCl_(5)`. Which of the following is the element X ?

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The correct Answer is:

`N_2` can form `NCl_3`, `N_2 O_5` and `Ca_3 N_2` but does not form `NCl_5` .

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