Which among the following is NOT a neutral ligand?
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The names of anionic ligands generally end in "-o" (like chloro, cyano, thiocyanato), while neutral ligands typically retain their standard molecular names (with a few special exceptions like aqua, ammine, and carbonyl).
Step 1: What is a neutral ligand?
A neutral ligand carries no overall charge. We want the one in the list that does carry a charge.
Step 2: Write each formula.
Ammine is $\text{NH}_3$, aqua is $\text{H}_2\text{O}$, and carbon monoxide is CO. All three are neutral.
Step 3: Spot the charged one.
Thiocyanate is $\text{SCN}^-$, which has a charge of $-1$. So it is the one that is not neutral.
\[ \boxed{\text{Thiocyanate}} \]
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