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The value of activity coefficient is always in which of the following ranges?

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The value of activity coefficient is always in which of the following ranges?

(a) Zero

(b) Less than zero

(c) Less than 1

(d) Greater than 1

This question was posed to me by my school teacher while I was bunking the class.

My query is from Ion Selective Electrodes-Principle and Types topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

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Correct option is (c) Less than 1

To elaborate: The value of activity coefficient is always less than 1. It is the ratio of activity divided by concentration.

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