Classification of Elements and Periodicity in Properties

Which of the following pairs has the same size? 

• Fe²⁺ , Ni²⁺

• Zr⁴⁺, Ti⁴⁺

• Zr⁴⁺, Hf⁴⁺

• Zr⁴⁺, Hf⁴⁺

Which one of the following ion has electronic configuration [Ar] 3d⁶?
(At. no:  Mn = 25, Fe = 26, Co = 27, Ni = 28)

• Ni³⁺

• Mn

• Fe³⁺

• Fe³⁺

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is 

• Mg< Ca < Cl < P

• Cl < P < Mg < Ca

• P < Cl < Ca < Mg

• P < Cl < Ca < Mg

Among the following which one has the highest cation to anion size ratio?

• CsI

• CsF

• LiF

• LiF

Which one of the element with the following outer orbital configuration may exhibit the largest number of oxidation states?

• 3d⁵,4s²

• 3d⁵,4s¹

• 3d⁵,4s²

• 3d⁵,4s²

Oxidation number of P in PO₄^3-, of S in SO₄^2- and that of Cr in Cr₂O₇^2- are respectively,

• +5,+6 and +6

• +3, + 6 and +5

• +5,+3 and +6

• +5,+3 and +6

Amongst the elements with following electronic configuration, which one of them may have the highest ionisation energy?

• [Ne] 3s² 3p³

• [Ne] 3s² 3p²

• [Ar] 3d¹⁰, 4s² 4p³

• [Ar] 3d¹⁰, 4s² 4p³

The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr(24) and Mn (25) is 

• Cr > Mn> V > Ti

• V > Mn > Cr >Ti

• Mn > Cr> Ti >V

• Mn > Cr> Ti >V

The sequence of ionic mobility in aqueous solution is 

• K⁺ > Na⁺ > Rb⁺ > Cs⁺
  

• Cs⁺ > Rb⁺ > K⁺ >Na⁺

• Rb⁺ > K⁺> Cs⁺ > Na⁺

• Rb⁺ > K⁺> Cs⁺ > Na⁺

Which of the following oxidation states are the most characteristics for lead and tin respectively? 

• +4,+2

• +2,+4

• +4,+4

• +4,+4