Assign reasons for the following:
(a) `Zn^(2+)` salts are white while `Cu^(2+)` salts are blue.
(b) Separation of lanthanoid elements is difficult. Explain.

Give reasons for the following: Zn^(2+) salts are white but Cu^(2+) salts are blue.

Explain why : Zn^(2+) salts are white whereas Cu^(2+) salts are coloured.

Assign reasons for the following: Cu(I) compounds are white and diamagnetic identical ?

Why are Cd^(2+) salts white ?

Assign reason for the following : (i) Ammonia is soluble in water while phosphine is not (ii) B_(2) is paramagnetic while C_(2) is not.

Assign reasons for the following: What is lanthanoid contraction ? Explain its any one consequence.

Assign reasons for the following : (b) The ionization energy of 5d elements are greater than 3d elements.

Assign reason for each of the following statement: (i) The largest number of oxidation states are exhibited by the elements in their row transition elements. (ii) The atomic radii decrease in Size with the increasing atomic number in the lanthanoid series

Assign reasons for the following : (i) Cu(I) ion is not known to exist in aqueous solutions. (ii) Transition metals are much harder than the alkali metals. (iii) From element to element, actinoid contraction is greater than the lanthanoid contraction.

Give reasons for the following An aqueous solution of the salt ammonium chloride is acidic in nature while an aqueous solution of sodium chloride is neutral.