NEETChemistryp Block Elements (Group 13 & 14)
What are the correct statements about the elements of group 13 given below? (I) The stability of +1 oxidation state follows the order T 1> 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
Options
- AI,III & V only
- BII,IV & V only
- CI,II & IV only
- DIII,IV & V only
Correct answer
A. I,III & V only
Step-by-step solution
Statement (II) is incorrect as Hig has the lowest melting and boiling points instead of B because of which it is liquid at R.T.. Statemert (IV) is incorrect de correct order of atomic radius is Ga < Al < In . This is due to increasing shells down the group and anomalous behaviour of Ga.