NEETChemistryChemical Kinetics
Why does the rate of the reaction become independent of the concentration of NH 3 at high pressure in the decomposition of gaseous ammonia?
Options
- ABecause NH 3 becomes a solid at high pressure.
- BBecause the metal surface gets saturated with gas molecules.
- CBecause the rate constant (k) changes at high pressure.
- DBecause the reaction becomes first order at high pressure.
Correct answer
B. Because the metal surface gets saturated with gas molecules.
Step-by-step solution
At high pressure, the metal surface becomes saturated with gas molecules, preventing further changes in the concentration of ammonia (NH 3 ) on the catalyst's surface. This saturation makes the rate of the reaction independent of NH 3 concentration.