A mixture of gases \(\mathrm{O_2}\), \(\mathrm{H_2}\) and \(\mathrm{CO}\) are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is :
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The Correct Option is C
Solution and Explanation
In a closed vessel adsorption removes gas molecules from the gas phase, so the total pressure decreases with time.
The rate of adsorption is greatest at the start (many free sites, high pressure) and decreases as sites fill and pressure drops, so the fall is exponential-like and the pressure becomes constant at a non-zero value when adsorption equilibrium is reached.
Option (1) is a straight line reaching zero (not possible), option (2) is constant (no adsorption), option (4) shows pressure increasing (wrong). The decaying curve flattening at a non-zero value is option (3).
Answer: (3) decreasing curve that gradually flattens (asymptotic decay)
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