Question:
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 silver nitrate solutions, two moles of AgCl get precipitated. The ionic formula of this complex would be
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 silver nitrate solutions, two moles of AgCl get precipitated. The ionic formula of this complex would be
Updated On: Dec 3, 2024
- $[Co(NH_3)_4NO_2Cl] [(NH_3)Cl]$
- $[Co(NH_3)_5Cl] [Cl(NO_2)]$
- $[Co(NH_3)_5(NO_2)]Cl_2$
- $[Co(NH_3)]_5.[(NO_2)_2Cl_2]$
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The Correct Option is C
Solution and Explanation
The molecular formula of complex is $Co(NH_3)_5NO_2Cl_2$. As the one mole of compound produces two moles of AgCl with $AgNO_3(aq)$, it has two ionisable $Cl^-$ ions per molecule. Thus, possible ionic formula is $[Co(NH_3)_5NO_2]Cl_2$ It ionises to produce one $[Co(NH_3)_5NO_2]^{2+}$ and two $Cl^-$ ions i.e., in all three ions per molecule
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.