Which of the following statements is/are not | vedclass

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(D) Adsorption is a spontaneous process accompanied by a decrease in enthalpy $(\Delta H < 0)$ and a decrease in entropy $(\Delta S < 0)$. Since $\Del

Vedclass · Accepted Answer

$C, D$

Vedclass · Answer

(D) Adsorption is a spontaneous process accompanied by a decrease in enthalpy $(\Delta H  |T\Delta S|$. Thus,statement $(A)$ is correct.$(B)$ Chemisorption involves the formation of chemical bonds between the adsorbate and the adsorbent. Gases that react strongly with the adsorbent surface exhibit chemisorption. Thus,statement $(B)$ is correct.$(C)$ According to the Freundlich adsorption isotherm,$\frac{x}{m} = k \cdot p^{1/n}$. If the slope $(1/n)$ is non-zero,the amount of gas adsorbed $(\frac{x}{m})$ depends on the pressure $(p)$. Therefore,adsorption is not independent of pressure. Thus,statement $(C)$ is incorrect.$(D)$ The gold number is defined as the minimum mass in milligrams of a protective colloid required to prevent the coagulation of $10 \ mL$ of a gold sol by the addition of $1 \ mL$ of $10 \% \ NaCl$ solution. The gold number for potato starch is approximately $20-25$,not $0.15$. Thus,statement $(D)$ is incorrect.Therefore,statements $(C)$ and $(D)$ are not correct.

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