d-Block elements

Which block of elements are known as transition elements?

• p-block

• s-block

• d-block

• f-block

Which one of the following is diamagnetic ion?

• Co²⁺

• Ni²⁺

• Cu²⁺

• Zn²⁺

Colour of transition metal ions are due to absorption of some wavelength. This results in

• d-s transition

• s-s transition

• s-t/transition

• d-d transition

Which of the following pairs of ions have the same electronic configuration?

• Cu²⁺, Cr²⁺

• Fe³⁺, Mn²⁺

• Co³⁺, Ni³⁺

• Sc³⁺, Cr³⁺

Lanthanoid contraction is due to increase in

• atomic number

• effective nuclear charge

• atomic radius

• valence electrons

Which of the following has magnetic moment value of 5.9 BM ?

• Fe²⁺

• Fe³⁺

• Ni²⁺

• Cu²⁺

Which of the following are d-block elements but not regarded as transition elements?

• Cu, Ag, Au

• Zn, Cd, Hg

• Fe, Co, Ni

• Ru, Rh, Pd

Transition elements form alloys easily because they have

• Same atomic number

• Same electronic configuration

• Nearly same atomic size

• None of the above

Which one of the following characteristics of the transition metals is associated with higher catalytic activity?

• High enthalpy of atomisation

• Paramagnetic behaviour

• Colour of hydrate ions

• Variable oxidation states

The property which is not characteristic of transition metals is

• variable oxidation states.

• tendency to form complexes.

• formation of coloured compounds.

• natural radioactivity.