A gas which burns with a blue flame is
Correct answer: D. CO
- A. CO₂
- B. NO
- C. N₂
- D. CO
Explanation
The correct answer is Option D: CO. Carbon monoxide (CO) is a flammable gas that, when burned in oxygen, produces a blue flame due to its exothermic reaction. It is commonly known for its use in gas stoves and heaters.Option A: CO₂ is incorrect because carbon dioxide is a non-flammable gas that is actually used to extinguish fires.Option B: NO is incorrect as nitric oxide is not known for burning with a blue flame.Option C: N₂ is incorrect because nitrogen is an inert gas that does not burn under normal conditions.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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