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A gas X(g) is when dissolved in water he...

A gas `X(g)` is when dissolved in water heat is evolved. Then solubility of `X'` will increase :

A

high temperature, low pressure

B

low temperature, high pressure

C

high temperature, high pressure

D

low temperature, high pressure

Text Solution

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The correct Answer is:
To solve the question regarding the solubility of gas `X(g)` in water when heat is evolved, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Nature of the Reaction**: - The question states that when gas `X` is dissolved in water, heat is evolved. This indicates that the dissolution process is **exothermic**. 2. **Understand the Implications of Exothermic Reactions**: - For exothermic reactions, the change in enthalpy (ΔH) is negative. According to Le Chatelier's principle, if we increase the temperature of an exothermic reaction, the equilibrium will shift to favor the endothermic (backward) reaction to absorb the excess heat. Conversely, decreasing the temperature will favor the exothermic (forward) reaction. 3. **Analyze Temperature Effects**: - Since the dissolution of gas `X` is exothermic, lowering the temperature will favor the forward reaction, thereby increasing the solubility of gas `X`. Therefore, **lower temperatures will lead to increased solubility**. 4. **Consider the Effect of Pressure**: - When gas `X` dissolves in water, it transitions from a gaseous state to a liquid (aqueous) state. This transition typically results in a decrease in volume because gases occupy more volume than liquids. - According to Boyle's law, increasing the pressure on a system will favor the side of the reaction that occupies less volume. Since the dissolution of gas `X` results in a decrease in volume, increasing the pressure will also favor the forward reaction and thus increase the solubility of gas `X`. 5. **Conclusion**: - To maximize the solubility of gas `X`, we should operate at **low temperature** and **high pressure**. Therefore, the correct answer is that the solubility of gas `X` will increase at low temperature and high pressure. ### Final Answer: The solubility of gas `X` will increase at **low temperature and high pressure**. ---
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