Solubility refers to the ability of substances to dissolve in a solvent. Of the gases listed here, that which would most likely dissolve in water is;
Carbon dioxide is a gas that has a very high solubility in water. When bubbled through water, 99% of the gas dissolves while 1% of the gas comes off as carbonic acid.
The solubility of carbon dioxide increases with an increase in pressure and decreases with an increase in temperature.
Therefore, option A is correct.
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