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Which one of the following ions is not classified as a pseudohalide?

1. CNO−
2. RCOO−
3. OCN−
4. NNN−

Correct answer: RCOO−

Solution

RCOO−, or the carboxylate ion, is not classified as a pseudohalide because it does not share the same structural and bonding characteristics typical of pseudohalides, which usually mimic the behavior of halides in chemical reactions.

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