JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Surface Chemistry

A mixture of gases

O_{2}, H_{2}

and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is:

(A)(see structure)
(B)(see structure)
(C)(see structure)
(D)(see structure)
✓ Correct

Answer: (D)

Solution

Charcoal is a strong adsorbent, and when the mixture of

O_{2}

H_{2}

and

CO

stands over it the gas molecules are progressively taken up on its surface. As adsorption proceeds the number of molecules left in the gas phase falls, so the pressure drops steadily from its initial value and then levels off as the surface approaches saturation and equilibrium is reached. The correct behaviour is the curve in which the pressure decreases with time and flattens to a constant value.

JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Single correct option

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