What are the correct statements about the elements of group 13 given below?
I) The stability of +1 oxidation state follows the order Tl > In > Ga
II) Boron has the lowest melting point and boiling point as it is a non-metal
III) Boron shows a maximum covalency of 4 in its compounds
IV) The order of atomic radius is Ga > Al > In
V) Aluminium is passive to concentrated nitric acid

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I, III & V only

II, IV, & V only

I, II, & IV only

III, IV, V only

answer is A.

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Detailed Solution

I) The stability of +1 oxidation state follows the order Tl > In > Ga because of inert pair effect.
III) Boron shows a maximum covalency of 4 in its compounds because only one s and 3 p orbitals are there for bonding with other elements.
V) Aluminium is passive to concentrated nitric acid because it forms its own oxide layer over its surface that protect Al metal to get affected by nitric acid.

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