Short Answer Type
Long Answer TypeDiscuss the characteristics of group 13 elements in terms of:
(i) Atomic and ionic radii
(ii) ionisation enthalpy
(iii) Density, melting point and boiling points.
Short Answer TypeLong Answer TypeExplain the following:
(i) Boron is trivalent
(ii) Boron and aluminium tend to form covalent compounds.
Discuss the pattern of variation in the oxidation states of B(Boron) to Tl(Thallium).
Or
What is inert pair effect? Illustrate it with reference to Boron family.
Short Answer TypeStandard electrode potential values 
and that of 
is +1.26 V. Predict about the formation of M3+ ion in solution and compare the electropositive character of the two metals.
Standard electrode potential values for two half-cell reactions indicate that aluminium has a high tendency to form Al3+ (aq) ions, while Tl3+ is not only unstable in solution but is also a powerful oxidising agent. Thus Tl+ is more stable in solution than Tl3+. Since aluminium being able to form +3 ions easily, therefore it is more electropositive than thallium.
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