What is hydrogen sulfide?
          What is hydrogen sulfide?.  a. A colorless, odorless, incombustible gas.  b. A poisonous gas, yellow in color which is combustible.  c. It is a poisonous, combustible, colorless gas having a taste and odor like rotten eggs.  d. A non-poisonous, combustible gas with an odor like rotten eggs.
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