Although It Is Not Present In Modern Natural Gas, Which Toxic Gas Was A Constituent Of Coal Gas?

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Although It Is Not Present In Modern Natural Gas, Which Toxic Gas Was A Constituent Of Coal Gas?

Question:
Although It Is Not Present In Modern Natural Gas, Which Toxic Gas Was A Constituent Of Coal Gas?
a)
Hydrogen Sulphide
b)
Phosgene
c)
Methane
d)
Carbon Monoxide

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Correct Answer
Carbon Monoxide
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