Select the correct answer. liquid
solid
pressure (atm)
gas
temperature (°C)
Which phases can coexist at equilibrium at point A on the phase diagram?
O A.
solid and gas
OB.
gas and liquid
Oc. liquid and solid
OD. solid, liquid and gas

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.