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O level Chemistry rate of reaction

I know that the correct answer is B. According to what I have learnt, higher concentration increases the rate of reaction but the amount of gas produced remains the same.(Please check the pictures) But in this question, the amount of gas produced is more in experiment 2 than 1. Please explain why this is the case.

I can't seem to attach my picture here anymore. Please help?



(edited 3 months ago)

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