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At the same temperature and pressure, 1 volume of nitrogen and 3 volumes of hydrogen combine. What is their volume ratio?

Answer and explanation

Correct answer: 1:3

The relevant principle is Gay-Lussac’s law of combining volumes, which states that reacting gas volumes, measured at the same temperature and pressure, are in simple whole-number ratios. The question already gives 1 volume of nitrogen and 3 volumes of hydrogen. Therefore, writing nitrogen first and hydrogen second, their ratio is 1:3, so option A is correct. The condition of equal temperature and pressure matters because gas volume changes when either condition changes. Option B reverses the order, option C incorrectly treats the two volumes as equal, and option D combines numbers in a way that does not represent the stated ratio. This is a volume comparison, not a mass or molecular-mass calculation.

Related tags

ChemistryGay-Lussac LawGaseous VolumesLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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