__________________ deals with adsorption equilibria?
Show answer Hide answer
Answer: C. Freundlich equation
Explanation
The Freundlich adsorption isotherm is an empirical equation utilized to describe adsorption equilibria across moderate ranges. It relates the quantity of gas or solute adsorbed per unit mass of adsorbent to the equilibrium fluid concentration. This widely used mathematical model successfully correlates adsorption data for numerous industrial separation systems. Adsorption involves the accumulation of fluid molecules onto the active internal surface of a porous solid adsorbent. Empirical isotherms provide practical working equations when detailed molecular adsorption mechanisms are unknown. Constants within the Freundlich equation are determined experimentally by plotting adsorption capacity against pressure logarithmically.
Water purification plants use activated carbon beds designed with adsorption isotherms to remove organic pollutants. Gas separation units rely on equilibrium adsorption data to size pressure swing adsorption vessels correctly. Chemical engineers use these models to predict breakthrough times and adsorbent replacement schedules in industry. Option A Fick's law governs molecular diffusion rates driven by concentration gradients within fluids. Option B Gibbs equation relates surface tension changes to adsorption densities at liquid interfaces. Option D is incorrect because the Freundlich equation directly addresses adsorption equilibrium relationships.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. _______________ column is commonly employed during gas absorption operations ?
Show answer Hide answer
Answer: D. Packed
Packed columns offer continuous countercurrent contact between rising gas and falling liquid. High operational flexibility makes packed towers ideal for continuous gas absorption duties. Structured or random packing prov...
Q2. A liquid blend consists of 30% o-xylene, 60% p-xylene, and 10% m-xylene by weight (w/w). Which statement correctly applies to this mixture ?
Show answer Hide answer
Answer: A. The mixture exhibits an azeotrope at 101.3 kPa
Xylene isomers possess very similar physical properties and boiling point ranges. Mixtures of o-xylene, p-xylene, and m-xylene form non-ideal solutions exhibiting azeotropic behavior. At standard atmospheric pressure, th...
Q3. An example of a minimum boiling azeotrope is provided by__________________________?
Show answer Hide answer
Answer: B. Acetone-carbon disulphide
Acetone and carbon disulphide form a binary mixture that exhibits a negative deviation from Raoult's law. This thermodynamic behavior creates a minimum boiling point lower than either pure component. Fractional distillat...
Q4. A plait point represents the locus on a solubility diagram where a tie-line collapses to a single point. For a ternary mixture featuring two pairs of partially miscible liquids, how many plait points exist ?
Show answer Hide answer
Answer: A. 0
A plait point represents the critical composition where conjugate phases become identical; systems with two partially miscible pairs have distinct phase boundaries.
Q5. A vapor mixture of 10% C6H6 in air at 25°C and 750 mm Hg exhibits a dew point of 20°C. Estimate its dew point when conditions change to 30°C and 700 mm Hg in _______________ °C?
Show answer Hide answer
Answer: D. 18.7
Changes in total system pressure and vapor mole fraction alter vapor-liquid equilibrium conditions. Applying thermodynamic phase equilibrium relations allows calculation of the new dew point temperature accurately. Adjus...
Q6. Which dryer is recommended for converting a slurry into flaky solids?
Show answer Hide answer
Answer: A. Spray dryer
Spray dryers atomize liquid feeds into extremely fine droplets inside hot gas streams. This atomization creates a massive surface area for rapid moisture evaporation. Droplets dry instantly into solid particles or fine p...