284) On doubling the concentration of reactant, half life of the reaction becomes (1⁄8) times the original vlue. Hence the energy of reverse reaction is:

285) N₂O₅ decomposes according to the equation N₂O₅ → 2NO₂ + (1⁄2)O₂. What is the unit of the rate of this reaction?

286) For a reaction 2A → products, it is found that the ratio of the rection doubles if the concentration of A is increased four times, calculate the order of the reaction:

287) In a reaction, the decreases in reactant's concentration is 20% in 20 minutes and 40% in 40 minutes. Calculate the order of the reaction and rate constant:

288) Which of the following conditions favours the existence of a substance in the solid state?