Ion-exchange method

Calgon's method

Treatment with sodium carbonate

Clark's method

Linear and blue in color

Linear and almost colorless

Non-planar and almost colorless

Planar and bluein color

CO(g) + H₂O(g) $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Catalyst}^{673K}} $$ CO₂(g) + H₂(g)

CH₄(g) + H₂O(g) $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Ni}^{1270K}} $$ CO(g) + 3H₂(g)

C(s) + H₂O(g) $$\buildrel {1270K} \over \longrightarrow $$ CO(g) + H₂(g)

2C(s) + O₂(g) + 4N₂(g) $$\buildrel {1273K} \over \longrightarrow $$ 2CO(g) + 4N₂(g)

greater than 300 K but less than 373 K

equal to 373 K

more than 373 K

less than 300 K