AP EAMCET · Chemistry · p Block Elements (Group 13 & 14)

Which of the following is water-gas shift reaction?

A $C (s) + H_{2} O (g) \overset{1270 K}{⟶} CO (g) + H_{2} (g)$
B ${CH}_{4} (g) + H_{2} O (g) \overset{1270 K}{⟶} CO (g) + 3 H_{2} (g)$
C $CO (g) + H_{2} O (g) \to_{ironchromate}^{673 K} {CO}_{2} (g) + H_{2} (g)$
D $2 H_{2} O (l) \to_{traces of acid / base}^{electrolysis} 2 H_{2} (g) + O_{2} (g)$

Verified Solution

Answer & Solution

Correct Answer

(C) $CO (g) + H_{2} O (g) \to_{ironchromate}^{673 K} {CO}_{2} (g) + H_{2} (g)$

Step-by-step Solution

Detailed explanation

The mixture of CO and H2 is called as water gas. As the mixture of CO and H2 is used for the synthesis of methanol and a number of hydrocarbons, it is also called 'syn gas' or synthesis gas. The process of producing 'syn gas' from coal is called coal gasification.…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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