Question
In $C,\,N,\,O$ and $F$ the electronegativity
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The correct order of their acidity is 

This is called:$[Cr(NH_3)_6] [Cr(NO_2)_6]$ and $[Cr(NH_3)_4(NO_2)_2] \,[Cr(NH_3)_2(NO_2)_4]$