Chemistry - d- & f- block Elements

Question - 1

Electonic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?

  • A 25
  • B 26
  • C 27
  • D 24

Question - 2

Among the following, the compound that does not exist is

  • A K2TiO4
  • B K2TiF6
  • C TiO2
  • D TiCl4

Question - 3

The number of unpaired electrons present in Ni2+ is

  • A 8
  • B 4
  • C 2
  • D 0

Question - 4

A transition metal in its highest oxidation state act as

  • A reducing agent
  • B an oxidising agent
  • C a chelating agent
  • D a central metal in a coordination compound

Question - 5

Which of the following does not show any colour in solution?

  • A V3+
  • B Co2+
  • C Cr3+
  • D Sc3+

Question - 6

Which of the following does not belong to 3d-transition series?

  • A Fe
  • B Cu
  • C Au
  • D Co

Question - 7

Zinc does not exhibit variable valency due to

  • A presence of complete filled d-orbitals
  • B inert pair effect
  • C presence of 4s-orbitals
  • D None of the above

Question - 8

Which of the following pair of compounds shows similar colour in aqueous medium?

  • A FeCl2 and MnCl2
  • B COCl2 and CuCl2
  • C VOCl2 and feCl2
  • D FeCl3 and CuCl2

Question - 9

For d-block elements, the first ionisation potential is in the order of

  • A Zn
  • B V>Cr>Mn>Fe
  • C Zn>Fe>Cu>Cr
  • D Sc>Ti>V>Cr

Question - 10

Among the following elements, the element with lowest enthalpy of atomisations

  • A Sc
  • B Cr
  • C Cu
  • D Zn
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