JEE Chemistry - MCQ Practice Questions

The rate constant for a reaction increases from 0.04 s⁻¹ to 0.16 s⁻¹ when temperature increases from 20°C to 40°C. What is the activation energy (Ea) approximately? (R = 8.314 J/mol·K)

A solution contains 0.1 M HCl and 0.1 M NaOH is added dropwise. At what point does the pH change most rapidly?

For the reaction 2A → B + C, if the half-life is independent of initial concentration, what is the order of reaction?

The Henry's law constant for CO₂ in water at 25°C is 1.67 × 10⁻³ mol/(L·atm). What is the solubility of CO₂ when its partial pressure is 0.8 atm?

For the electrochemical cell Zn|Zn²⁺||Cu²⁺|Cu, if E°(Zn²⁺/Zn) = -0.76 V and E°(Cu²⁺/Cu) = +0.34 V, what is the ΔG° for the reaction? (F = 96500 C/mol)

Which of the following is a colligative property?

For a reversible reaction at equilibrium, if Kc = 4 at 298 K, what is ΔG°? (R = 8.314 J/mol·K)

The specific conductance of a 0.01 M KCl solution is 0.0141 S/cm. What is the molar conductivity?

Which statement about entropy is correct?

A buffer solution contains 0.1 M acetic acid (Ka = 1.8 × 10⁻⁵) and 0.1 M sodium acetate. What is the pH? (log 1.8 = 0.255)

For an ideal gas at constant temperature, if volume is doubled, what happens to the entropy change?

Which of the following represents the correct relationship between Qc and Kc for a reaction at non-equilibrium?

A first-order reaction has a rate constant of 0.05 s⁻¹. What percentage of the reactant remains after 50 seconds?

For the Gibbs free energy equation ΔG = ΔH - TΔS, a reaction is always spontaneous when:

A 0.50 M solution of a weak acid HA has pH 2.5. Calculate Ka. (log 3.16 = 0.5)

For a galvanic cell, which statement is true?

For the complex ion [Fe(CN)₆]⁴⁻, if the crystal field splitting energy is 35,000 cm⁻¹, what is the wavelength of light absorbed?

A solution of HCl (0.1 M) is titrated with NaOH (0.1 M). After adding 50 mL of HCl and 49 mL of NaOH, what is the approximate pH?

At 25°C, the ionic product of water (Kw) is 1.0 × 10⁻¹⁴. What is the pH of a solution where [H⁺] = 2.5 × 10⁻⁵ M?

Which of the following factors does NOT affect the rate of a chemical reaction?