A coordination complex compound of cobalt has the molecular formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three mole ions in an aqueous solution and on reacting this solution with excess of AgNO3, AgCl precipitated. The ionic formula for this complex would be

According to the question, as 3 moles ions are being produced, so at least 2 chloride ions should be present as counter ions outside the coordination sphere because among the 3 ions produced, 1 of them will be the COORDINATION COMPOUNDS 8 complex ion itself while the other 2 will be the counter ions. If both the cation and anion are complexes then only 2 ions will be produced upon ionization. Hence, 3 5 2 2 [Co(NH ) (NO )]Cl complex in option (a) will produce 3 ions and is the correct answer.