The structure of diborane (B2H6) contains
four 2C-2e- bonds and four 3C-2e- bonds
two 2C-2e- bonds and two 3C-3e- bonds
two 2C-2e- bonds and four 3C-2e- bonds
four 2C-2e- bonds and two 3C-2e- bonds
In silica (SiO2), each silicon atom is bonded to
two oxygen atoms
four oxygen atoms
one silicon and two oxygen atoms
one silicon and four oxygen atoms
Dry ice is
Solid H2O
Solid CO2
Solid N2O4
Solid NH3
B.
Solid CO2
Solid CO2 sublimes directly to the vapour state (without converting into liquid) at-78°C under atmospheric pressure, hence used as a refrigerant and called dry ice or cardice. It is used to freeze metals, ice-cream and in laboratory as a coolant.