Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

271) If for a certain first−order reaction, the initial rate is 0.65% min⁻¹, the half life in one hour is:

Answer is:

1.776

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:}

Answer is:

(1000⁄2.303) K

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:

Answer is:

H₂SO₄ is stronger than HCl

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?

Answer is:

1.25 x 10⁴ minutes

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)

Answer is:

1

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