1.

Which combination is odd with respect to oxidation number ?

Answer»

`H_(2) SO_(5) , H_(2) S_(2) O_(8) ,K_(2)Cr_(2) , SF_6`
`K_(2)Cr_(2)O_(7) , K_2CrO_(4) , CrO_(5) , CrO_(2) Cl_2`
`NH_3, NH_(4)^(+), N_(3) H, NO_2^(-)`
`CaH_(2), NaH, LIH , MgH_2`

Solution :`overset(+3)(NH_3),overset(-3)(NH_4),overset((-1)/3)(N_3),overset(-3)(NO_2^(-))`


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