The structure of diborane contains:

Boron compounds behave as Lewis acids because of their

When orthoboric acid $(H_3BO_3)$ is heated,the residue left is:

Borax is used as a cleansing agent because on dissolving in water it gives:

Which of the following compounds is formed in the borax bead test?

The correct statements from the following are:
$(A)$ Ionic radii of trivalent cations of group $13$ elements decrease down the group.
$(B)$ Electronegativity of group $13$ elements decreases down the group.
$(C)$ Among the group $13$ elements, Boron has the highest first ionisation enthalpy.
$(D)$ The trichlorides and triiodides of group $13$ elements are covalent in nature.
Choose the correct answer from the options given below: