AEEE - Chemistry Mock Tests

In the reaction MnO₄⁻ + Fe²⁺ + H⁺ → Mn²⁺ + Fe³⁺ + H₂O, the n-factor of KMnO₄ in acidic medium is:

The number of electrons in the valence shell of the central atom in NH₃ is:

The Langmuir adsorption isotherm at very high pressure gives θ → 1 (complete surface coverage). The corresponding Freundlich isotherm predicts:

Which compound gives a positive Tollens' test?

The rate constant of a reaction doubles when the temperature is increased from 300 K to 310 K. What is the activation energy (Eₐ) of the reaction? (R = 8.314 J K⁻¹ mol⁻¹, log 2 = 0.3010)

Which of the following has the highest lattice energy?

Which of the following is the correct order of electron gain enthalpy (with negative sign) for halogens?

According to the third law of thermodynamics, what is the entropy of a perfect crystal at absolute zero (0 K)?