Assertion: Chelates are less stable than ordinary coordination compounds.
Reason: Chelates can be formed by bidentate ligands.
(A)Both assertion and reason are correct and reason is the correct explanation for assertion.
(B)Both assertion and reason are correct but reason is not the correct explanation for assertion.
(C)Assertion is incorrect but reason is correct.
(D)Both assertion and reason are incorrect.
Last updated date: 17th Mar 2023
•
Total views: 204.6k
•
Views today: 2.84k
Answer
204.6k+ views
Hint :Coordination complexes are compounds that consist of one or more metal centers which are bonded to ligands and ions- cations or anions. Ligands are ions or molecules that donate a pair of electrons to the central metal atom. A chelate is formed when a polydentate ligand is bonded to the central metal atom.
Complete Step By Step Answer:
Ligands are ions or molecules bound to the central metal atom in the coordination entity. When it is bound through a single donor atom, like in $ C{l^ - },{H_2}O,N{H_3} $ , then it is called unidentate ligand. If it can bind through two donor atoms of the same molecule as in $ {H_2}NC{H_2}C{H_2}N{H_2}\,and\,{C_2}O_4^{2 - } $ ,it is called bidentate ligand and if there are more than two donor atoms in a molecule, then it is called polydentate. Didendate and polydentate ligands use their multiple donor atoms to bind to the metal center, forming chelate ligands. They can form cyclic complexes. Such chelate complexes are thermodynamically stable than similar complexes with unidentate ligands. Therefore, the given assertion is a wrong statement and the reason is correct.
The right option is (C)Assertion is incorrect but reason is correct.
Note :
The stabilization of coordination complexes due to chelation is called chelate effect.It is dependent on Gibb’s energy , entropy, enthalpy and is measured in terms of stepwise stability constant $ (\kappa ) $ or overall stability constant $ (\beta ) $ . Here, stability of complex refers to the degree of association between two species in equilibrium.
Complete Step By Step Answer:
Ligands are ions or molecules bound to the central metal atom in the coordination entity. When it is bound through a single donor atom, like in $ C{l^ - },{H_2}O,N{H_3} $ , then it is called unidentate ligand. If it can bind through two donor atoms of the same molecule as in $ {H_2}NC{H_2}C{H_2}N{H_2}\,and\,{C_2}O_4^{2 - } $ ,it is called bidentate ligand and if there are more than two donor atoms in a molecule, then it is called polydentate. Didendate and polydentate ligands use their multiple donor atoms to bind to the metal center, forming chelate ligands. They can form cyclic complexes. Such chelate complexes are thermodynamically stable than similar complexes with unidentate ligands. Therefore, the given assertion is a wrong statement and the reason is correct.
The right option is (C)Assertion is incorrect but reason is correct.
Note :
The stabilization of coordination complexes due to chelation is called chelate effect.It is dependent on Gibb’s energy , entropy, enthalpy and is measured in terms of stepwise stability constant $ (\kappa ) $ or overall stability constant $ (\beta ) $ . Here, stability of complex refers to the degree of association between two species in equilibrium.
Recently Updated Pages
Most eubacterial antibiotics are obtained from A Rhizobium class 12 biology NEET_UG

Salamin bioinsecticides have been extracted from A class 12 biology NEET_UG

Which of the following statements regarding Baculoviruses class 12 biology NEET_UG

Sewage or municipal sewer pipes should not be directly class 12 biology NEET_UG

Sewage purification is performed by A Microbes B Fertilisers class 12 biology NEET_UG

Enzyme immobilisation is Aconversion of an active enzyme class 12 biology NEET_UG

Trending doubts
Difference Between Plant Cell and Animal Cell

Write an application to the principal requesting five class 10 english CBSE

Ray optics is valid when characteristic dimensions class 12 physics CBSE

Give 10 examples for herbs , shrubs , climbers , creepers

Write the 6 fundamental rights of India and explain in detail

Write a letter to the principal requesting him to grant class 10 english CBSE

List out three methods of soil conservation

Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE

Epipetalous and syngenesious stamens occur in aSolanaceae class 11 biology CBSE
