Wednesday, September 3, 2014

Which toxic gas was the first to be used in chemical warfare in World War I ? a) Hydrogen sulphide b) Carbon Monoxide c) Nitrogen dioxide d) Chlorine



Ques: Which toxic gas was the first to be used in chemical warfare in World War I ?
a) Hydrogen sulphide
b) Carbon Monoxide
c) Nitrogen dioxide
d) Chlorine

Click here for answer
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