JEE Chemistry - MCQ Practice Questions

For a spontaneous process at constant temperature and pressure, which relationship is always true?

A solution has [OH⁻] = 1.0 × 10⁻⁸ M at 25°C. Is this solution acidic, basic, or neutral?

For the reaction 2A + B → C, if the rate law is Rate = k[A]²[B], what is the overall order of the reaction?

Which of the following statements about electrochemical cells is correct?

For a reaction at 300 K, ΔH = 50 kJ/mol and ΔS = 100 J/(mol·K). Calculate ΔG.

What is the half-life of a first-order reaction with rate constant k = 0.693 s⁻¹?

A weak acid HA has Ka = 1.8 × 10⁻⁵. What is the pH of a 0.2 M solution of HA?

Which statement correctly describes the relationship between Gibbs free energy and equilibrium constant?

An ideal gas undergoes isothermal expansion from 2 L to 8 L at 300 K. Calculate the entropy change if n = 1 mol.

The solubility product (Ksp) of AgCl at 25°C is 1.8 × 10⁻¹⁰. What is the solubility in mol/L?

A buffer solution is prepared by mixing 100 mL of 0.1 M acetic acid (Ka = 1.8 × 10⁻⁵) with 50 mL of 0.1 M NaOH. What is the pH?

For the complex ion [Cu(NH₃)₄]²⁺, what is the coordination number of Cu²⁺?

Which of the following represents a second-order reaction with respect to reactant A?

For an exothermic reaction with ΔH = -100 kJ/mol, what must be true for the reaction to be non-spontaneous at high temperatures?

A galvanic cell is constructed using Zn/Zn²⁺ (E° = -0.76 V) and Cu/Cu²⁺ (E° = +0.34 V) electrodes. What is the standard cell potential?

At equilibrium, for the reaction N₂O₄ ⇌ 2NO₂, Kp = 0.15 atm at 300 K. If initial pressure of N₂O₄ is 1 atm, calculate the partial pressure of NO₂ at equilibrium.

For a reaction mechanism with a rate-determining slow step, which statement is correct?

The activation energy of a forward reaction is 60 kJ/mol and the reaction is exothermic with ΔH = -40 kJ/mol. What is the activation energy of the reverse reaction?

The rate constant for a reaction doubles when temperature increases from 27°C to 37°C. What is the activation energy (Ea) for this reaction? (Given: R = 8.314 J/mol·K)

The decomposition of H₂O₂ follows first-order kinetics with k = 1.4 × 10⁻³ min⁻¹. What is the half-life of H₂O₂?