The time taken for 10% completion of a first order reaction is 20 min. Then, for 19% completion, the reaction will take
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For a chemical reaction A → B, the rate of the reaction is 2 × 10–3 mol dm–3 s–1 when the initial concentration is 0.05 mol dm–3. The rate of the same reaction is 1.6 × 10–2 mol dm–3 s–1 when the initial concentration is 0.1 mol dm–3. The order of the reaction is