JEE Main 2020 · 5 September · morning · Single correct · +4 / −1
The equation that represents the water-gas shift reaction is :
- (a) CO(g) + H₂O(g) → _(Catalyst)^(673K) CO₂(g) + H₂(g)
- (b) CH₄(g) + H₂O(g) → _(Ni)^(1270K) CO(g) + 3H₂(g)
- (c) C(s) + H₂O(g) →(1270K) CO(g) + H₂(g)
- (d) 2C(s) + O₂(g) + 4N₂(g) →(1273K) 2CO(g) + 4N₂(g)
Answer and solution
Answer (a) CO(g) + H₂O(g) → _(Catalyst)^(673K) CO₂(g) + H₂(g)
Solution
Chemistry ma’am · 3 steps
Shift the CO you already have: with steam it becomes CO₂ and gives you more H₂.
- Why it exists. Water gas (CO + H₂) and syngas from methane still contain a lot of CO. Reacting that CO with steam gives extra H₂, which raises the hydrogen yield.
CO(g) + H₂O(g) →(673 K, catalyst) CO₂(g) + H₂(g)
- Recognise it. The reactants are CO and steam, the products are CO₂ and H₂, and it runs at about 673 K over an iron chromate catalyst. The CO₂ formed is then removed by scrubbing with sodium arsenite solution.
Option Reactants and conditions Name of the process (a) Carbon monoxide and steam, 673 K, catalyst water-gas shift reaction (b) Methane and steam, 1270 K, Ni steam reforming of methane (gives syngas) (c) Coke and steam, 1270 K making water gas (d) Coke and air (oxygen with nitrogen) making producer gas - So. Only (a) converts CO and steam into CO₂ and H₂. That is the water-gas shift reaction.
The idea to keep. Making water gas uses coke and steam. Shifting it uses the CO in that gas plus more steam to give CO₂ and extra H₂. Look for CO on the left and CO₂ on the right.
Answer from the NTA final answer key. Solution by PrepWiser.