QCEVault

Chemical equilibrium — Question 102

Original QCE Vault practice · 1 mark

Q102 · Practice questionComplex familiar1 mark

QUESTION 102

A mixture is at equilibrium for A(g)⇌2B(g). The vessel volume is instantly halved at constant temperature. Immediately after compression, before any net reaction, the reaction quotient is

(A)
2Kc.
(B)
Kc.
(C)
Kc/2.
(D)
4Kc.
Question linkSyllabus coverage

Related questions

  1. Q7 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 7 Which of the following is exchanged with the surroundings when a chemical reaction reaches dynamic equilibrium? (A) gases (B) matter (C) energy (D) products
    Chemical equilibrium
  2. Q17 · 2025 QCAA · Paper 1 · 1 mark
    QUESTIONS 17–18 Questions 17–18 refer to the relationship between the concentration of nitrogen (N2), hydrogen (H2) and ammonia (NH3) in a closed system, as shown. N2(g) + 3H2(g)  2NH3(g) + heat NH3 Concentration (mol L−1) H2 N2 t1 Time (min)
    QUESTION 17 Determine the equilibrium law expression (Kc) for the reaction. [ ] 2 NH 3 (A) K = c [ ] [ ] N 3 H 2 2…
    Chemical equilibrium
  3. Q18 · 2025 QCAA · Paper 1 · 1 mark
    QUESTIONS 17–18 Questions 17–18 refer to the relationship between the concentration of nitrogen (N2), hydrogen (H2) and ammonia (NH3) in a closed system, as shown. N2(g) + 3H2(g)  2NH3(g) + heat NH3 Concentration (mol L−1) H2 N2 t1 Time (min)
    QUESTION 18 Determine the change applied to the system at t1. (A) N2(g) was added. (B) Pressure was increased. (C…
    Chemical equilibrium
  4. Q19 · 2025 QCAA · Paper 1 · 1 mark
    QUESTIONS 19–20 Questions 19–20 refer to the reversible chemical reaction and enthalpy level diagram shown. 2AB2(g) + B2(g)  2AB3(g) 100 80 Energy (kJ mol−1) 60 40 20 0 Progress of forward reaction QUESTION 19 Which statement is true for the forward reaction? (A) Energy is a product. (B) The reaction is endothermic. (C) Enthalpy change (ΔH) is positive.…
    Chemical equilibrium