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Question

At which of the following pressure, the solubility of oxygen in the water will be maximum?


A
100 bar
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B
200 bar
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C
300 bar
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D
400 bar
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Solution

The correct option is C 400 bar
If the pressure is increased, the gas molecules are "forced" into the solution since this will best relieve the pressure that has been applied. The number of gas molecules dissolved in solution will also increase. So, an increase in pressure increases solubility, whereas a decrease in pressure decreases solubility. This statement is formalized in Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution. 

Chemistry

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