Three liquids are given to you. one is hydrochloric acid; another is  sodium hydroxide and third is a sugar solution. how will you identify  them? you have only turmeric indicator. 

h

c is the answer because when something is left after something evaporates that shows the chemical change.

what is the question here. i think you messed up.

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.