Arpit Mishra

Carbon monoxide is poisonous for humans because it can quickly form a complex with human haemoglobin. The complex built between CO and Hb (CO-Hb) is very stable, even more than the oxyhemoglobin complex (O2-Hb) by almost 300 times. Thus, in this state, haemoglobin does not further bind to oxygen.

When boric acid is heated, it converts to metabolic acid, which on further heating gives boron trioxide. Answer: On strong heating, first the Boric acid (H3BO3) breaks up into Metaboric acid (HBO2) and Water (H2O). On further heating, the Metaboric acid breaks up into Boric oxide (B2O3) and Water.

Boron has three valence electrons so it is supposed to make three bonds in a molecule with hybridisation sp2 as only s and two p orbitals are used in hybridisation because last p orbital is vacant.
But the case of diborane is different. In diborane bonding of B atom with H and other B is different. Is has two three-centre 2-electron bonds, each one consisting of the two boron atoms and a hydrogen atom sharing two electrons.

The molecule has a total of 12 valence electrons, three from each boron atom and one from each hydrogen atom. In this molecule, each of the two boron atoms will be bonded to two hydrogen atoms via covalent bonds. These bonds will use up 8 of the 12 valence electrons.
The other four valence electrons will be shared by the remaining two hydrogen atoms and by the boron atoms, each particle contributing one orbital to the formation of the 3-centre 2-electron bond. Such a relationship is called the banana bond.