The d- and f-Block Elements Chemistry - The d- and f-Block Elements

The chemical formla of chromite ore is :

Element showing the highest number of oxidation states is :

Which of the following metals of 3 d series has the lowest melting point?

The metal showing the largest number of oxidation states is :

The pair of metals that can be purified by Von-Arkel method :

____________ and actinoids are called as inner transition elements.

____________ metal has the lowest melting point among the transition elements of the first series.

Most of the ____________ elements are radioactive.

CrO is an ____________ oxide.

Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

Write the electronic configurations of the elements with the atomic numbers 61, 91, 101, and 109.

Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.

What do you understand by lanthanoid contraction?

In what way is the electronic configuration of the transition elements different from to that of the non-transition elements?

What are the characteristics of the transition elements and why are they called transition elements? Which of the d-block elements may not be regarded as the transition elements?

Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with : 
(i) Iodide, (ii) Iron, (II) solution and (iii) H₂S

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

Compare the chemistry of actinoids with that of the lanthanoids with special reference to : 
(i) electronic configuration
(ii) atomic and ionic sizes
(iii) oxidation state and
(iv) chemical reactivity.

Explain the various uses of lanthanoids.

Describe the differences in the properties of lanthanoids and actinoids.

What are the similarities between lanthanoids and actinoids?

Explain the general characteristics of actinoids in the following terms:
(i) Physical properties
(ii) Chemical reactivity
(iii) Magnetic properties
(iv) Ionization enthalpy.

Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical coloumns. Give special emphasis on the following points :
(i) Electronic configurations
(ii) Oxidation states
(iii) Ionisation enthalpies and
(iv) Atomic sizes.

Give examples and suggest reasons for the following features of the transition metal chemistry :
(i) The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
(ii) A transition metal exhibits highest oxidation state in oxides and fluorides.
(iii) The highest oxidation state is exhibited in oxoanions of a metal.