UPSC NDA II 2018 General Ability Solved Paper

Concept:Syngas (synthesis gas) is a fuel gas mixture of carbon monoxide and hydrogen.Explanation:Syngas is primarily composed of $CO(g)$ and $H_{2}(g)$.Among the given options, only option C lists exactly this combination.Option A ($C(s) + H_{2}O(g)$) represents the reactants for producing syngas via the water-gas reaction, not the product mixture.Option B ($CO(g) + H_{2}O(g)$) would produce $CO_{2}$ and $H_{2}$ via the water-gas shift reaction.Option D ($NO_{2}(g) + H_{2}(g)$) forms ammonia and water under certain conditions.Thus, only option C matches the composition of syngas.Answer:Option C: $CO(g) + H_{2}(g)$