Magnetic moment of K₃[Fe(CN)₅(H₂O)] is

1. 0

2. 4.92

3. 3.87

4. 2.83

The electronic configuration of a transition element X in +3 Oxidation state is [Ar]3d⁵.

The atomic number of X is :

1. 25

2. 26

3. 27

4. 24

In the dichromate ion Cr₂O₇^2-,

1. 4 Cr-O bonds are equivalent

2. 6 Cr-O bonds are equivalent

3. All Cr-O bonds are equivalent

4. None of Cr-O bonds are equivalent

The main reason for a larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is

1. The lesser energy difference between 5f and 6d orbitals than 4f and 5d orbitals

2. Larger atomic size of actinoids than the lanthanoids

3. More energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

4. Greater reactive nature of the actinoids than the lanthanoids

HgCl₂ and I₂ both when dissolved in water containing I^- ions the pair of species formed is

(a) HgI₂, ${\mathrm{I}}_3^{-}$                              (b) HgI₂, I^-

(c) ${\mathrm{HgI}}_4^{2-}, {\mathrm{I}}_3^{-}$                             (d) Hg₂I₂, I^-

The incorrect statement regarding the lanthanons is ;

The correct electronic configuration of Gadolinium(Atomic number = 64)  is :

1. [Xe]4f⁸6d²                   

2. [Xe]4f⁹5s¹

3. [Xe]4f⁷5d¹6s²                   

4. [Xe]4f⁶5d²6s²

Assuming complete ionisation, same moles of which of the following compounds will

require the least amount of acidified KMnO₄ for complete oxidation?

1. FeSO₄

2. FeSO₃

3. FeC₂O₄

4. Fe(NO₂)₂

The reason for lanthanoid contraction is:

1. Negligible screening effect of 'f' orbitals

2. Increasing nuclear charge

3. Decreasing nuclear charge

4. Decreasing screening effect

A diamagnetic lanthanoid ion among the following is :

(At. numbers:  Ce = 58, Sm = 62, Eu = 63, Yb = 70)

1. Ce²⁺

2. Eu²⁺

3. Sm²⁺

4. Yb²⁺