Q26 / 160 · AP EAMCET 2023 (16 May Shift 1) · Chemistry
Consider the reactions
L. $\mathrm{CO}+3 \mathrm{H}_2 \stackrel{\mathrm{A}}{\longrightarrow} \mathrm{CH}_4+\mathrm{H}_2 \mathrm{O}$
II. $\mathrm{CO}+2 \mathrm{H}_2 \stackrel{\text { B }}{\longrightarrow} \mathrm{CH}_3 \mathrm{OH}$
III. $\mathrm{O}_2+2 \mathrm{H}_2 \stackrel{\mathrm{C}}{\longrightarrow} 2 \mathrm{H}_2 \mathrm{O}$
The catalysts $\mathrm{A}, \mathrm{B}, \mathrm{C}$ are respectively
- Correct answerA$\mathrm{Ni}, \mathrm{ZnO}-\mathrm{Cr}_2 \mathrm{O}_3, \mathrm{Pt}$
- B$\mathrm{Pt}, \mathrm{ZnO}-\mathrm{Cr}_2 \mathrm{O}_3$, Ni
- C$\mathrm{CuCl}_2, \mathrm{Ni}, \mathrm{V}_2 \mathrm{O}_5$
- D$\mathrm{Pd}, \mathrm{Pt}, \mathrm{ZnO}-\mathrm{Cr}_2 \mathrm{O}_3$
Solution
Different catalysts result in different degrees of reduction. All these catalysts absorb hydrogen gas but due to different reactions conditions and activity of the catalysts, we get different products.
$\begin{aligned} & \mathrm{CO}+3 \mathrm{H}_2 \stackrel{\mathrm{Ni}}{\longrightarrow} \mathrm{CH}_4+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{CO}+2 \mathrm{H}_2 \stackrel{\mathrm{ZnO}-\mathrm{Cr}_2 \mathrm{O}_3}{\longrightarrow} \mathrm{CH}_3 \mathrm{OH} \\ & \mathrm{O}_2+2 \mathrm{H}_2 \stackrel{\mathrm{Pt}}{\longrightarrow} 2 \mathrm{H}_2 \mathrm{O}\end{aligned}$
Hence, the correct answer is option: 'A'.