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The number of manganese ions in tetrahedral and octahedral sites, respectively in Mn3O4 are:
The spinels CoFe2O4 and FeFe2O4, respectively are:
In the trigonal bipyramidal crystal field, the d orbital with the highest energy is:
The magnetic moment of the complex K3[CoF6] is 5.0 μB . The total stabilization energy will be:
For the complexion [Cu(NH3)6]2+,the coordinat ion geometry will be:
The correct statement about the Cu–N bond distance in [Cu(NH3)6]2+ is:
Which of the following shows NORMAL spinel structure:
The spinels have the general chemical formula AB2X4.
AII = a divalent cation like Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, Sn
BIII = a trivalent cation like Al, Ga, In, Ti, V, Cr, Mn, Fe, Fe, Co, Ni
X = O, S, Se etc.
Examples of Normal Spinels: MgAl2O4 (known as spinel), Mn3O4, ZnFe2O4, FeCr2O4 (chromite) etc.
CFSE of transition metal complexes can be determined by:
Which of the following pairs of electronic configuration of high–spin transition metal ions (3d) in an octahedral field undergo a substantial Jahn–Teller distortion:
According to the crystal field theory, Ni2+ can have two unpaired electron in:
For the complexes:
(IV) [Ti(H2O)6]3+ ,
The ideal octahedral geometry will not be observed in:
Correct Answer :- d
Explanation : [Cr(H2O)6]3+ shows the strongest distortion from the regular octahedral structure.
The central Cr atom in +2 oxidation state has d7 outer electronic configuration. It has degenerate electronic states occupying the eg orbital set and tend to show stronger Jahn-Teller effects.
The enthalpies of hydration of Ca2+, Mn2+, Zn2+ follow the order:
The correct order of acidity among the following species is:
The correct order of d-orbital splitting in a trigonal bipyramidal geo metry is:
It is known that pKa of water is 15.7. Based on this water pKa benchmark, arrange the fo llowing solvated metals–aqua io ns in order of their increasing acidity : Mn2+(H2O)6 , Fe3+(H2O)6, Cu2+(H2O)6 ,Ca2+(H2O)6
Correct Answer :- D
Explanation : The general trend of increasing electronegativity of the element when moving from left to right ia any horizontal row. The electronegativity increases due to which charge separation and ionization of hydrides increases.This increases the acidic strength of hydrides.
The correct order is :
Ca2+, Mn2+, Fe3+, Cu2+
The pair of simple and inverse spinels respectively is:
Stabilization of highest oxidation states of transition metals by strong electronegative ligands due to:
The volume (in mL) of 0.1 M AgNO3 required for complex precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H2O)5Cl]Cl2, as silver chloride is close to
The number of donor sites in dimethyl glyoxime, glycinato, diethylene triamine and EDTA are respectively:
Among the complexes:
(III) K4[Mn(CN)6], Jahn – Teller distortion is expected in.
The complex [Fe(phen)2(NCS)2] (phen = 1,10–phenanthroline) shows spin cross–over behavior.CFSE and µeff at 250 and 150 K, respectively are:
Given that the expected spin-only magnetic moment for (Et4N)2[NiCl4] is 2.83 BM, the total number of unpaired electrons in this complex is.
Of the following metal ions, which has the largest magnetic moment in its low-spin octahedral complexes?
The electronic configurations that have orbital angular momentum contribution in octahedral environment are: