You are a crime scene investigator who has been called to the scene of an apparent chemical attack. You are asked to determine what type of chemical agents are present. You have a full set of colorimetric tubes. Explain in detail the process of identifying the chemicals that are present by using the colorimetric tubes. Specifically include procedures for your self-protection in the chemical hazard zone.

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.