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why NH3 is strong complexing reagent than cl- ?

Dear Student,

NH3 acts as a complexing agent by donating the lone pair of electron present in non-bonding orbital of nitrogen. On the other hand, Cl- acts as a complexing agent by donating the charge. Hence, NH3 acts as strong complexing agent. 

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It is because of the lone pairs present on N in NH3. It can easily form complexes with other elements.NH3 has more tendency to form covalent and coordination compounds. But Cl​  mostly forms ionic compound to become more stable and tends to show -1 oxidation state. Compared to NH3 ; Cl- has weak complexing reagent. That is why NH3 is strong complexing reagent than Cl-.
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