Question:
The kinetics of the Pidgeon process is controlled by:
The kinetics of the Pidgeon process is controlled by:
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Pidgeon process relies on hydrogen reduction under vacuum conditions.
Updated On: Jun 29, 2026
- H$_2$O vapour
- SiO vapour
- MgO vapour
- H$_2$ vapour
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The Correct Option is D
Solution and Explanation
Concept:
Pidgeon process is used for extraction of magnesium:
\[
MgO + Ca \rightarrow Mg(g) + CaO
\]
Then magnesium is condensed.
Step 1: Identify reducing environment.
The process occurs under: - high temperature - vacuum - presence of reducing gas (H$_2$)
Step 2: Rate controlling step.
The reaction kinetics depends on: - availability and diffusion of hydrogen - reduction of MgO by hydrogen Thus H$_2$ vapour controls kinetics. Final Answer: \[ \boxed{\text{H}_2 \text{ vapour}} \]
Step 1: Identify reducing environment.
The process occurs under: - high temperature - vacuum - presence of reducing gas (H$_2$)
Step 2: Rate controlling step.
The reaction kinetics depends on: - availability and diffusion of hydrogen - reduction of MgO by hydrogen Thus H$_2$ vapour controls kinetics. Final Answer: \[ \boxed{\text{H}_2 \text{ vapour}} \]
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