The Lewis acid nature of $BX_3$ follows the order
Boron form covalent compound due to
Give industrial preparation for diborane.
Given below are two statements :
Statement $I$ : Boron is extremely hard indicating its high lattice energy
Statement $II$ : Boron has highest melting and boiling point compared to its other group members.
In the light of the above statements, choose the most appropriate answer from the options given below
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is :-