Identify catalyst used in following reaction. CO _ ( g ) + H ₂ O _ ( g ) 623 ~K CO _ 2( ~g ) + H _ 2( ~g )

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Water-Gas Shift Reaction: CO _ ( g ) + H ₂ O _ ( g ) 623 ~K CO _ 2( ~g ) + H _ 2( ~g ) The reaction at 623 K represents the high-temperature water-gas shift process, which employs iron oxide-chromium oxide catalysts (iron chromate) to enhance hydrogen production and reduce carbon monoxide. Among the options, vanadium pentoxide catalyzes sulfuric acid production, nickel metal facilitates hydrogenation and reforming, and acid/alkali traces serve other catalytic purposes. Iron chromate remains the standard catalyst fo