12 what is elastic strain?
a
the point on earth's surface located directly
above the earthquake focus
b
the point inside earth where movement first
occurs during an earthquake
c
the surface of a break in a rock along which
there is movement
d
the snapping back of a rock that has been
strained by force

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.