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The d-And-f-Block Elements

Multiple Choice Questions

561.

The IUPAC symbol for the element with atomic number 119 would be:

562.

Consider the hydrated ions of Ti²⁺,v²⁺, Ti³⁺ and Sc³⁺ The correct order of their spin only magnetic moments is :

Ti³⁺ < Ti²⁺< Sc³⁺< V²⁺
Vi²⁺ <Ti²⁺< Ti³⁺ < Sc³⁺
Sc³⁺< Ti³⁺< Ti²⁺<V²⁺
Sc³⁺< Ti³⁺< V²⁺< Ti²⁺

563.

Three complex [CoCl(NH₃)₅]²⁺ (I)[Co(NH₃)₅H₂O]³⁺(II) and [Co(NH₃)₆]³⁺(III) absorb light in the visible region . the correct order of the wavelength of light absorbed by them is :

II > I > III
III > I > II
I> II> III
III> II> I

564.

The correct order of the first ionization enthalpies is :

Ti < Mn < Ni < Zn
Mn < Ti < Zn < Ni
Ti < Mn < Zn < Ni
Zn < Ni < Mn < Ti

565.

The highest possible oxidation states of uranium plutonium , respectively are

6 and 7
7 and 6
4 and 6
6 and 4

566.

When copper is heated with conc. HNO3 it produces

Cu(NO₃)₂ and NO
Cu(NO₃)₂, NO and NO₂
Cu(NO₃)₂ and N₂O
Cu(NO₃)₂ and N₂O

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567.

Which one of the following statements is correct when SO₂ is passed through acidified K₂Cr₂O₇ solution?

The solution is decolourized
SO₂ is reduced
Green Cr₂(SO₄)₃ is formed
The solution turns blue

568.
Because of lanthanoid contraction, of elements which of the following elements have nearly same atomic radii ? (Number in the parenthesis are atomic number).

Ti (22) and Zr(40)

Zr(40) and Nb (41)

Zr (40) and Hf (72)

Zr (40) and Hf (72)

Zr (40) and Hf (72)

Because of the lanthanoid contraction Zr (atomic radii 160 pm) and Hf (atomic radii 158 pm) have nearly same atomic radii.
Lanthanoids include the elements from lanthanum La (Z=57) to lutetium Lu(Z =71).Zirconium Zr (40) belong to the second transition series (4d) and Hf (72) belongs to third transition series (5d). Lanthanoid contraction is associated with the intervention of the 4f orbitals which are filled before the 5d- series of elements starts. The filling of 4f if orbitals before 5d orbitals result in a regular decrease in atomic radii which compensates the expected increases in atomic size with increasing atomic number. As a result of this lanthanoid contraction, the elements of second and third transition series have almost similar atomic radii.

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