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‘He’ gas effuse from a hole of 10 dm^3 vessel in “5” seconds. The time for effusion of O2 from the same hole of 10 dm^3 will be?

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‘He’ gas effuse from a hole of 10 dm^3 vessel in “5” seconds. The time for effusion of O2 from the same hole of 10 dm^3 will be? Answer: 14.1 seconds

According to Graham’s law, the rate of effusion is inversely proportional to the square root of molar mass. Since O₂ is heavier than He, it effuses slower, taking more time. Thus, time for O₂ = 14.1 s from the same vessel and hole.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.