Question:
In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with both aqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide ?
In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with both aqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide ?
Updated On: Apr 16, 2024
- $Zn^{+2},Al^{+3}$
- $Al^{+3} ,Cu^{+2}$
- $Pb^{+2},Cu^{+2}$
- $Cu^{+2},Zn^{+2}$
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The Correct Option is A
Solution and Explanation
$Zn ^{2+}, Al ^{3+}$
(i) $zn(OH)_2 +2NaOH \longrightarrow Na[Zn(OH)_4^{2 -} + 2Na^ +$
$\underset{\text{Anhydrous}}{ZnCl_2} + 4NH 3 \longrightarrow \underset{\text{Tetraamine
zinc chloride}}{Zn(NH_3)_4Cl_2}$
$Al ( OH )_{3}+ NaOH \longrightarrow\left[ Al ( OH )_{4}\right]^{-}$
$Al ^{3+}+3 NH _{3} \longrightarrow Al \left( NH _{3}\right)_{3}$
(i) $zn(OH)_2 +2NaOH \longrightarrow Na[Zn(OH)_4^{2 -} + 2Na^ +$
$\underset{\text{Anhydrous}}{ZnCl_2} + 4NH 3 \longrightarrow \underset{\text{Tetraamine
zinc chloride}}{Zn(NH_3)_4Cl_2}$
$Al ( OH )_{3}+ NaOH \longrightarrow\left[ Al ( OH )_{4}\right]^{-}$
$Al ^{3+}+3 NH _{3} \longrightarrow Al \left( NH _{3}\right)_{3}$
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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.