1 mol of an octahedral metal complex with formula $\mathrm{MCl}_{3} \cdot 2 \mathrm{~L}$ on reaction with excess of $\mathrm{AgNO}_{3}$ gives 1 mol of AgCl . The denticity of Ligand L is \_\_\_\_ (integer answer)

JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Coordination Compounds

1 mol of an octahedral metal complex with formula

MCl_{3} \cdot 2 L

on reaction with excess of

AgNO_{3}

gives 1 mol of AgCl . The denticity of Ligand L is ____ (integer answer)

Answer: 2

Solution

Excess

AgN O_{3}

precipitates only the chloride present as free counter-ion, and

1

mol of complex yields

1

mol of

AgCl

, so exactly one

Cl

lies outside the coordination sphere and the other two are coordinated: the complex is

[MC l_{2} L_{2}] Cl

. For an octahedral centre the coordination number is

6

, so the two

L

ligands together fill

6 - 2 = 4

sites, giving

2

donor sites each. The denticity of

L

2

JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Integer answer

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