272) The rate constants k₁ and k₂ for two different reactions are 10^{16e−2000⁄T and 1015e−1000⁄T respectively. The temperature at which ₁ = k₂ is:}

273) When ethyl acetate was hydrolysed in presence of 0.1 N HCl, the rate constant was found to be 5.40 x 10⁻⁵ sec⁻¹. But when 0.1 N H₂SO₄ was used for hydrolysis, the rate constant was found to be 6.25 x 10⁻⁵sec⁻¹. Thus it may conclude that:

274) The rate constant for a second order reaction is 8 x 10⁻⁵M⁻¹sec⁻¹. How long will it take for a 1M solution to be reduced to 0.5M?

275) Calculate the order of reaction for which rate becomes half if the volume of container having same amount of reactant is doubled: (assume gaseous phase reaction)

276) A first order reaction takes 69.3 minutes for 50% completion. How much time will be needed for 80% completion?