Free Test Chemical equilibrium – NEET

Q1: What is chemical equilibrium?

A. State where reactants and products are formed at equal rates B. State where reaction stops C. State where only products exist D. State where only reactants exist

Q2: Which of the following is true at equilibrium?

A. Concentrations of reactants and products remain constant B. Reaction stops C. Only products are present D. Only reactants are present

Q3: Equilibrium constant (K) is expressed in terms of:

A. Concentrations of products and reactants B. Temperature only C. Pressure only D. Volume only

Q4: If K >> 1, the reaction favors:

A. Products B. Reactants C. Neither D. Both equally

Q5: Le Chatelier’s principle states:

A. System shifts to counteract changes B. System remains unaffected C. System stops reaction D. System speeds reaction infinitely

Q6: Increasing pressure on gaseous equilibrium shifts reaction to:

A. Side with fewer moles of gas B. Side with more moles of gas C. No effect D. Side with equal moles

Q7: Increasing temperature in an exothermic reaction shifts equilibrium to:

A. Reactants B. Products C. No effect D. Equally both

Q8: Which expression correctly represents Kc for a reaction aA + bB ⇌ cC + dD?

A. Kc = [C]^c [D]^d / [A]^a [B]^b B. Kc = [A]^a [B]^b / [C]^c [D]^d C. Kc = [A] + [B] / [C] + [D] D. Kc = [C] + [D] / [A] + [B]

Q9: A catalyst in equilibrium reaction:

A. Speeds up forward and reverse reaction equally B. Only speeds forward reaction C. Only speeds reverse reaction D. Has no effect

Q10: Which is true for dynamic equilibrium?

A. Forward and reverse reactions continue at equal rates B. Reactions stop C. Only forward reaction occurs D. Only reverse reaction occurs

Q11: What happens if a reactant is removed at equilibrium?

A. Equilibrium shifts to produce more reactants B. Equilibrium shifts to produce more products C. No change D. Reaction stops

Q12: The unit of equilibrium constant Kc depends on:

A. Difference between sum of products and reactants powers B. Temperature C. Pressure D. Volume

Q13: Which factor does NOT affect equilibrium constant K?

A. Pressure B. Temperature C. Nature of reactants D. Catalyst presence

Q14: If reaction quotient Q < K, reaction will:

A. Proceed forward to form products B. Proceed backward to form reactants C. Remain unchanged D. Stop

Q15: The equilibrium constant expression for heterogeneous equilibria:

A. Includes only gaseous and aqueous species B. Includes all species C. Includes only solids D. Excludes all species

Q16: Which of the following increases the value of K?

A. Increase in temperature for endothermic reaction B. Decrease in temperature for endothermic reaction C. Adding catalyst D. Increasing pressure

Q17: At equilibrium, Gibbs free energy change ΔG is:

A. Zero B. Positive C. Negative D. Infinity

Q18: Which of the following is true for reversible reactions?

A. Both forward and backward reactions occur B. Only forward reaction occurs C. Only backward reaction occurs D. Reactions do not occur

Q19: The reaction 2SO2 + O2 ⇌ 2SO3 has Kc = 500 at 700K. Which side is favored?