Consider the reactions:
$I$. $CO + 3 H_2 \xrightarrow{A} CH_4 + H_2 O$
$II$. $CO + 2 H_2 \xrightarrow{B} CH_3 OH$
$III$. $O_2 + 2 H_2 \xrightarrow{C} 2 H_2 O$
The catalysts $A, B, C$ are respectively:

  • A
    $Ni, ZnO-Cr_2 O_3, Pt$
  • B
    $Pt, ZnO-Cr_2 O_3, Ni$
  • C
    $CuCl_2, Ni, V_2 O_5$
  • D
    $Pd, Pt, ZnO-Cr_2 O_3$

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