Select the graph that correctly describes the adsorption isotherms at two temperatures $T_{1}$ and $T_{2} \left(\mathrm{T}_{1}>\mathrm{T}_{2}\right)$ for a gas : ( x - mass of the gas adsorbed ; m - mass of adsorbent ; P - pressure)

JEE Main · 2021 · 31 Aug 2021 · Shift 1 · Surface Chemistry

Select the graph that correctly describes the adsorption isotherms at two temperatures

T_{1}

and

T_{2} (T_{1} > T_{2})

for a gas :
( x - mass of the gas adsorbed ; m - mass of adsorbent ; P - pressure)

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

Answer: (A)

Solution

Adsorption of a gas is exothermic, so at a fixed pressure the amount adsorbed per unit mass of adsorbent decreases as temperature rises. With

T_{1} > T_{2}

, the isotherm at

T_{2}

lies above that at

T_{1}

at every pressure, each curve climbing steeply at low pressure and then levelling towards saturation as the surface fills. The correct isotherm shows the lower-temperature curve

T_{2}

lying above the higher-temperature curve

T_{1}

JEE Main · 2021 · 31 Aug 2021 · Shift 1 · Single correct option

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