Physical Chemistry Mock Tests

The half-life of a first-order reaction is 69.3 s. The rate constant of the reaction is: (a) 0.01 s⁻¹ (b) 0.1 s⁻¹ (c) 1 s⁻¹ (d) 0.001 s⁻¹

A solution contains 0.01 M Ag+ and 0.01 M Ba2+. Potassium chromate (K2CrO4) is slowly added. Ksp of Ag2CrO4 = 1.1 x 10^-12 and Ksp of BaCrO4 = 1.2 x 10^-10. Which salt precipitates first and at what [CrO4 2-]?

At 1000 K, the equilibrium constant for the reaction N₂(g) + O₂(g) ⇌ 2NO(g) is 4.0 × 10⁻⁴. If 0.8 mol of N₂ and 0.2 mol of O₂ are mixed in a 2 L flask at this temperature, the equilibrium concentration of NO is:

Light of wavelength 200 nm is incident on a metal surface with work function 3.0 eV. The photoelectrons emitted are then accelerated through a potential difference of 2.0 V. The de Broglie wavelength of the accelerated electrons is approximately:

The entropy of a perfect crystal at absolute zero (0 K) is:

The half-life of a first-order reaction is 69.3 seconds. The rate constant k is:

The number of moles of electrons produced when 1 faraday of charge passes through an electrolytic cell is:

The van't Hoff factor for a compound that undergoes dimerization in solution is: