282) 16.0 gm of a radioactive substance is reduced to 0.50 g after 2 hours. Then the half life of the radioactive substance is:

283) The decomposition of N₂O into N₂ and O follows the second order kinetics with K = ( 5 x 10 ¹¹ mol⁻¹sec⁻¹) e ^{−29000K⁄T} then, the energy of activation of this reaction is:

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: