What are the correct statements about the elements of group 13 given below?
(I) The stability of +1 oxidation state follows the order 
(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 
In
(V) Aluminium is passive to concentrated nitric acid
Text Solution
Verified by ExpertsA
Statement (II) is incorrect as 
has the lowest melting and boiling points instead of B because of which it is liquid at R.T.
Statement (IV) is incorrect as the correct order of atomic radius is 
In.
This is due to increasing shells down the group and anomalous behaviour of Ga.
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