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Ionic Bond

At a low pres...

Question

At a low pressure, the curves of gas (A) adsorbed by a unit mass of a solid adsorbent ( $x / m v s P$ ) at three different temperatures $T_{x}, T_{y} a n d T_{z}$ that have slopes 0.57 , 1 and 1.73 respectively. Which one of the following is correct?

T_{x} > T_{y} > T_{z}

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T_{z} > T_{y} > T_{x}

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T_{z} > T_{y} > T_{x}

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T_{x} > T_{y} < T_{z}

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Solution

The correct option is A $T_{x} > T_{y} > T_{z}$
Adsorption is exothermic, so the extent of adsorption is higher at lower temperatures.
The curve that has a larger value of the slope would happen at a lower temperature.
$T_{x} > T_{y} > T_{z}$ is the order of temperatures.

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