A) Water vapour
B) Helium
C) Sulphur dioxide
D) Carbon dioxide
Correct Answer: A
Solution :
[a] The abundance of gases varies considerably from volcano to volcano. Water vapour is consistently the most common volcanic gas, normally comprising more than 60% of total emissions. Carbon dioxide typically accounts for 10 to 40% of emissions. The principal components of volcanic gases are water vapour (\[{{H}_{2}}O\]), carbon dioxide (\[C{{O}_{2}}\]), sulfur either as sulfur dioxide (\[S{{O}_{2}}\]) (high-temperature volcanic gases) or hydrogen sulfide (\[{{H}_{2}}S\]) (low-temperature volcanic gases), nitrogen, argon, helium, neon, methane, carbon monoxide and hydrogen.
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