A coordination complex compound of cobalt has 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. On reacting this solution, with excess of AgNO3 solution two moles of AgCl get precipitated. The ionic formula of this complex cant be

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[Co(NH3)4NO2Cl] [(NH3)Cl]

[Co(NH3)5Cl] [Cl(NO)2]

[Co(NH3)5(NO2)]Cl2

[Co(NH3)5][(NO2)2Cl2]

answer is A.

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Detailed Solution

Since the complexwith AgNO3 solution gives two moles of AgCl it must have two ionisable Cl atoms. Hence the complex is [Co(NH3)5NO2]Cl2. On ionization it will give three moles of ion viz [Co(NH3)5NO2]2++2Cl−

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