Question

Odd man out of Na+,Cl-,Cu+,NH4+

Answer 1

Cl-is an anion while others are cation.

Answer 2

The odd one is $Cl^-$.

• Among the ions $Na^+$ is a cation as it contains a positive charge and called sodium ion.
• $Cu^+$ is a cation as it contains a positive charge and called copper ion.
• $NH_4^+$ is a cation as it contains a positive charge and called ammonium ion.
• $Cl^-$ is an anion as it contains a negative charge and called chloride ion.
• So, here only $Cl^-$ is an anion and other ions means sodium ion, copper ion and ammonium ion are cation. So, that's why chloride ion is the odd one.