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Question

Which of the following is not true regarding Henry's law constant?

A
It has same unit as that of pressure
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B
It decreases with increase in temperature
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C
It decreases with increase in solubility
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D
Different gas-liquid system have different KH
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Solution

The correct option is B It decreases with increase in temperature
Henry's law states that the solubility of a gas in a liquid at a given temperature is directly proportional to its partial pressure of the gas present above the solution.

P=KH𝓧

Where P is the partial pressure​ of gas over the solution, KH is Henry’s law constant​ and 𝓧 is mole fraction of the​ gas in the solution.

Hence, KH is the same unit as that of pressure. So, option (a) is correct. KH increases with increase in temperature, so, option (b) is not correct. Option (c) and option (d) is also correct.

Therefore, the correct answer is option (b).

Theory:
Characteristics of Henry’s Law Constant​:
1. Same unit as that of Pressure​
2. Different gas-liquid system have different values of henry's law constant.​
3. It increases with temperature​
4. It depends on intermolecular forces between gas-liquid.​
5. Its value decreases with increase in solubility .


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