The total number of ions produced from the complex [Cr(NH3)6]Cl3 in aqueous solution will be ________.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 4
In a coordination compound, the ligands inside the square brackets stay bound to the metal, and only the counter ions outside the brackets separate as free ions in water.
In \( \ce{[Cr(NH3)6]Cl3} \), all six \( \ce{NH3} \) molecules are inside the coordination sphere and the three chloride ions are outside it:
\( \displaystyle \ce{[Cr(NH3)6]Cl3 -> [Cr(NH3)6]^3+ + 3Cl^-} \)
\( \displaystyle 1+3=4\ \text{ions} \)
So the complex gives 4 ions in aqueous solution; it is a 1:3 electrolyte.
NCERT (2026-27 edition):
Werner’s Theory of Coordination Compounds – …
