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Chemistry Hard CSS FPSC Uploaded: 14 Jul 2026

Which law states that gases combine in simple whole number ratios by volume at the same temperature and pressure?

  • A Gay-Lussac's Law
  • B Boyle's Law
  • C Charles's Law
  • D Avogadro's Law
Correct Answer: Option A — Gay-Lussac's Law
Explanation:
Gay-Lussac's Law of Combining Volumes states that gases react in simple whole number ratios by volume at constant temperature and pressure providing evidence for atomic theory.
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