If ammonium cyanate is heated in the absence of air, the only product of the reaction is urea, CO(NH$_2)$$_2$. No other products are formed in the reaction.
What is the formula of the cyanate ion present in ammonium cyanate?
1 )
CON$_2^ - $
2 )
CON$_2$$^{2-}$
OCN$^-$
4 )
OCN$^{2-}$
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