The carbonyl stretching frequency (νCO) for the complexes (i) [Co(CO)4]- (ii) [Ni(CO)4] and (iii) [Fe(CO)4]2- will follow the trend :
(ii) > (i) > (iii)
All three are isoelectronic d10 tetrahedral carbonyls
More negative charge on the metal = more M→CO π back-donation into CO π* = weaker C-O bond = lower νCO
Charge: [Ni(CO)4] = 0, [Co(CO)4]- = -1, [Fe(CO)4]2- = -2
νCO ≈ 2060 cm-1 (Ni) > 1890 cm-1 (Co) > 1790 cm-1 (Fe)
Hence, (ii) > (i) > (iii).
Similar Questions
The hybridization for the complex ion [FeF6]3- and [Fe(CN)6]3- is :
Which of the following diatomic molecules is paramagnetic ?
Size of the d orbitals for Si, P, S and Cl follow the order :
The molecules P4 and CH4 exhibit the same :
The bond order for O2 and the hypothetical molecules N2- and O2+ will follow the trend :
According to CFT, Ni2+ can have two unpaired electrons in :
Which of the following complexes will NOT exhibit ideal octahedral geometry ?
The spin only magnetic moment for the complex Hg[Co(SCN)4] is :
The molecular formula for sodium bis (thiosulphato) argentate (I) is :
The number of terminal carbonyl ligands in the complex [η5 - CPRh(CO)]3 (where CP is cyclopentadienide anion) such that each Rhodium centre satisfies the 18 electron rule is :
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
