The partial pressure of gas A in the mixture increases with the addition of C in the gas.
Partial pressure is the pressure exerted by individual gas in a mixture.
The partial pressure is defined by the pressure exerted by the molecule with collisions.
The A is present in the mixture, and the addition of C results in the increased pressure of the mixture. However, there has been increased collisions of A with the nearly C molecules.
Thus, the addition of C in the mixture results in increased partial pressure of A.
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