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For which of the following combinations, does the absorption operation become gas -film controlled?

  • $P$. The solubility of gas in the liquid is very high
  • $Q$. The solubility of gas in the liquid is very low
  • $R$. The liquid-side mass transfer coefficient is much higher tan the gas-side mass transfer coefficient 
  • $S$. The liquid-side mass transfer coefficient is much lower than the gas-side mass transfer coefficient
  1. $\text{P & Q}$
  2. $\text{P &R}$
  3. $\text{P & S}$
  4. $\text{Q & R}$
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