551.

Which one of the following ions exhibits d-d transition and paramagnetism as well?

• $Cr{O}_4^{2-}$

• $C{r}_2{O}_7^{2-}$

• $Mn{O}_4^{2-}$

• $Mn{O}_4^{-}$

Iron carbonyl, Fe(CO)₅ is

• Tetranuclear

• Mononuclear

• Dinuclear

• Trinuclear

The type of isomerism shown by the complex [CoCl₂(en)₂] is

• Geometrical isomerism

• Coordination isomerism

• Linkage isomerism

• Ionization isomerism

The geometry and magnetic behaviour of the complex [Ni(CO)₄] are

• Square planar geometry and diamagnetic

• Tetrahedral geometry and diamagnetic

• Tetrahedral geometry and paramagnetic

• Square planar geometry and paramagnetic

Consider the following species:
CN⁺, CN^–, NO and CN

Which one of these will have the highest bond order?

• NO

• CN^-

• CN

• CN⁺

Which of the following compound is not coloured?

• Na₂CuCl

• Na₂Cd.Cl₄

• FeSO₄

• VI₃

Which of the following coordination compounds would exhibit optical isomerism?

• Pentamminentirocobalt (III) iodide

• Tris-(ethylenediamine) cobalt (III) bromide

• Trans-dicyanobis (ethylenediamine)

• Diamminedinitroplatinum (II)

Sulphur reacts with chlorine in 1:2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. The hybridization of the central atom in the anion Y is

• sp³

• sp²

• sp³d

• sp

In [CO(H2O)6]²⁺, there are three unpaired electrons present. The $\mathrm{\mu }$_calculated is 3.87 BM which is quite different from the $\mathrm{\mu }$_experimental of 4.40 BM. This is because of

• increase in number of unpaired electrons

• some contribution of the orbital motion of the electron to the magnetic moment

• change in orbital spin of the electron

• d-d transition

Anhydrous mixture of KF and HF contain which types of ions?

• K⁺, H⁺, F^-

• {KF⁺, (HF^-)}

• KH⁺, F^-

• K⁺, H${\mathrm{F}}_2^{-}$