Which one of the following is not a base?

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(D) Explanation: $HN_3$ (hydrazoic acid) dissociates into $N_3^-$ and $H^+$. Due to the release of $H^+$ ions,it acts as an acid.$N_2H_4$ (hydrazine)

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$HN_3$

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(D) Explanation: $HN_3$ (hydrazoic acid) dissociates into $N_3^-$ and $H^+$. Due to the release of $H^+$ ions,it acts as an acid.$N_2H_4$ (hydrazine) has a lone pair on nitrogen atoms,which it can donate,making it a base.$NH_2OH$ (hydroxylamine) is basic because it can accept a proton.$(CH_3)_3N$ (trimethylamine) is a tertiary amine and acts as a weak base due to the lone pair on the nitrogen atom.

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