Chemistry - Mole Concept Question with Solution | TestHub
ChemistryMole ConceptLaws of Chemical CalculationsMedium2 minQB
ChemistryMediumsingle choice
The following statements are given for different laws of chemical combination. Which of the following statement(s) is/are correct?
1. Gay-Lussac's law of gaseous volumes is valid only for ideal gases under all conditions.
2. The law of conservation of mass is valid only for reactions carried out in a closed container and not in an open container.
3. The same volume of nitrogen at STP combines with two different volumes of oxygen at STP to form NO₂ and N₂O₄.
4. A fixed mass of iron can combine with different masses of oxygen under different conditions.
Options:
Answer:
D
Solution:
- False. Gay-Lussac's law holds for gases measured at the same temperature and pressure; it is not limited to ideal gases or valid under all conditions.
- False. The law of conservation of mass applies to all reactions except nuclear reactions, in open or closed containers.
- False. N₂ + 2O₂ → 2NO₂ and N₂ + 2O₂ → N₂O₄: in both, N₂ : O₂ = 1 : 2 by volume (same T and P). So the same volume of nitrogen combines with the same volume of oxygen in both, not with two different volumes.
- True. Iron forms FeO and Fe₂O₃, so a fixed mass of iron combines with different masses of oxygen (law of multiple proportions).
So only statement 4 is correct: option D.
Stream:JEESubject:ChemistryTopic:Mole ConceptSubtopic:Laws of Chemical Calculations
⏱ 2mℹ️ Source: QB
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