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If a question mentions litres and same temperature pressure which law should be considered first?

Answer and explanation

Correct answer: Gay-Lussac's law of gaseous volumes

The direct answer is A. The clues are ‘litres’ and the same temperature and pressure. Gay-Lussac's law of gaseous volumes states that reacting gas volumes, measured at the same temperature and pressure, bear simple whole-number ratios. A is correct because it directly matches both the quantity and the conditions. B, definite proportions, concerns the fixed mass ratio of elements in a pure compound, not specifically gas volumes. C, multiple proportions, compares different compounds made from the same elements. D, reciprocal proportions, concerns combining ratios among elements and compounds. The exam method is: gas volume plus same temperature and pressure → Gay-Lussac. Memory cue: same T and P, compare gas litres.

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ChemistryLawsCombination

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