Question

# In the adsorption of a gas on solid, Freundlich isotherm is obeyed. Thus, if the slope of the plot is zero, then the extent of adsorption is:

A
directly proportional to the pressure of gas
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B
inversely proportional to the pressure of the gas
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C
independent of the pressure of the gas
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D
proportional to the square of the pressure of the gas
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Solution

## The correct option is D independent of the pressure of the gasFreundlich gave an empirical relationship between the quantity of gas adsorbed by a unit mass of solid adsorbent and the pressure at a particular temperature. The relationship can be expressed by the following equation: xm=KP1/n On taking logarithm on both sides of the equation, logxm=logK+1nlogP Here 1n is slope and if it is zero then adsorption is independent of pressure as 1nlogP=0

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