Which is an example of physical weathering? limestone in rock dissolving when acid rain flows across it

bits of rock rusting when exposed to oxygen and water

wind blowing off bits of a rock over time

oxidation of certain metals in rock

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.

the answer is symmetrical : )