Test: Crystal Field Theory (CFT) & Colour of Complexes - NEET MCQ

The crystal field splitting energy (Δ_o) of

I. [CoBr₆]^3- II. [CoF₆]^3- 
III. [Co(NCS)₆]^3- IV. [Co(CN)₆]^3- is in the order of

A magnetic moment of 1.73 BM will be shown by one among the following

The correct order o f ligand field strength is

The crystal field splitting energies (CFSE) of high spin and low spin d⁶ metal complexes in octahedral complex in terms of Δ_o respectively are

The Δ_t of the following complexes follows the order

I. [CoCI₄]^2-

II. [CoBr₄]^2-

III. [Co(NCS)₄]^2-

In which of the following coordination entities, the magnitude Δ_o (CFSE in octahedral field) will be maximum ?

The increasing order of wavelength of absorption for the complex ions

I. [Cr(NH₃)₆]³⁺

II. [CrCI₆]^3-

III. [Cr(H₂O)₆]³⁺
IV. [Cr(CN)₆]^3-

is :

Direction (Q. Nos. 11-15) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. 

Which of the following metal ions cannot form both high spin and low spin octahedral complexes?

Which is/are the correct statements?

CFSE is zero for the complexes with

CFSE value depends on

Octahedral complex of Cr (III) will be

Comprehension Type

Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have.

Passage

In octahedral complexes due to repulsion between the ligands and d-orbitals, there is splitting of d-orbitals into two sets, i.e. two orbitals of higher energy called eg and three orbitals of lower energy called t_2g. The difference of energy between the two sets of d-orbitals is called crystal field stabilisation energy denoted by Δ_o. For any given metal cation, the magnitude of Δ_o depends on the nature of ligands.

Q. 

The CFSE for d⁷ configuration for strong ligand field is

In octahedral complexes due to repulsion between the ligands and d-orbitals, there is splitting of d-orbitals into two sets, i.e. two orbitals of higher energy called eg and three orbitals of lower energy called t_2g. The difference of energy between the two sets of d-orbitals is called crystal field stabilisation energy denoted by Δ_o. For any given metal cation, the magnitude of Δ_o depends on the nature of ligands.

Q. 

In the following complexes of manganese, the distribution of electrons in d-orbitals of manganese

i. [Mn(H₂O)₆]²⁺

ii. [Mn(CN)₆]^4-

Matching List Type

Direction (Q. No. 18-19) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d) out of which one is correct.

Q. 

Match the Column I with Column II and mark the correct option from the codes given below.

Match the Column I with Column II and mark the correct option from the codes given below.

One Integer Value Correct Type

Direction (Q. Nos. 20-24) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

Number of unpaired electrons in d⁶, low spin octahedral complex.

The number of ligands which have strong crystal field splitting than

H₂O among SCN^-, NCS^-, EDTA^4- , , , Br^-, PPh₃, F^-

The total number of unpaired electrons in the two complexes [Cr(H₂O)₆]²⁺ and [Cr(CN)₆]^4- having octahedral geometry are

Number of unpaired electrons in t_2g and e_g orbitals in weak octahedral ligand fields with d⁷ configuration.

In tetrahedral complexes having weak field ligand, pairing starts with ...... electron.

Statement Type

Direction (Q. No. 25) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Statement I : The value of CFSE for the octahedral complex [Co(NH₃)₆]³⁺ is - 2.4Δ_o.

Statement II : The ammonia molecule is strong field ligand.