Which of the following molecule/ion does not exist?

P C l_{6}^{-}

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I C l_{3}

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B F_{4}^{-}

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X e F_{3}^{-}

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Solution

The correct options are
A $P C l_{6}^{-}$
C $X e F_{3}^{-}$
These all ions does not exist because during the reaction not much amount of energy is released to unpair paired electrons and excite one of them to higher orbital.

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P C l_{6}, N C l_{5}, X e F_{4}, O F_{4}, S H_{2}, T e F_{7}

In the given pairs which of the following pairs of molecules/ions, both the species does not likely to exist?

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