Which of the following are correct statements
A) Diborane reacts with NH₃ at high temperature to form Borazole
B) In Borax bead test, color exhibited by cobalt metaborate is blue.
C) Melting point of Gallium is very low
D) Maximum covalency of Boron is six

B₂​H_6​+NH_3​→B_3​N_3​H₆ (at extreme high temperature)

In the borax bead test of Co²⁺, the blue color of the bead is due to the formation of .

The addition of cobalt salt causes the dark hue of the borax bead. In oxidizing and reducing components, copper salt produces sky blue and red colors.

Gallium has a very low melting point of 29.76°C.

The cobalt metaborate (Co(BO₂)₂) it gives the Co²⁺test its blue color.

Because in boron, d-orbital is absent, so maximum covalency of B is 4.