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Chemical Equilibrium

39 questions · Chemistry · NEET
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Chemical Equilibrium

39 questions · Chemistry · NEET

  1. For the reaction A(g)⇌2 B( g), the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500 , at 1000 K. [Given : R=0.0831 L atm mol−1 K−1…2025 · Q112 · MCQ
  2. Higher yield of NO in N2​( g)+O2​( g)⇌2NO(g) can be obtained at [ΔH of the reaction =+180.7 kJ mol−1]…2025 · Q133 · MCQ
  3. In which of the following equilibria, Kp​ and Kc​ are NOT equal?2024 · Q128 · MCQ
  4. For the reaction 2 A⇌B+C,Kc​=4×10−3. At a given time, the composition of reaction mixture is: [A]=[B]=[C]=2×10−3M.  Then,…2024 · Q135 · MCQ
  5. Consider the following reaction in a sealed vessel at equilibrium with concentrations of N2​=3.0×10−3M,O2​=4.2×10−3M and NO=2.8×10−3M. 2NO(g)​⇌N2( g)​+O2( g)​…2024 · Q149 · MCQ
  6. At a given temperature and pressure, the equilibrium constant values for the equilibria are given below: ​3 A2​+B2​⇌2 A3​ B, K1​ A3​ B⇌23​ A2​+21​ B2​, K2​​…2024 · Q111 · MCQ
  7. For the reaction in equilibrium N2​( g)+3H2​( g)⇌2NH3​( g),ΔH=−Q Reaction is favoured in forward direction by:2024 · Q122 · MCQ
  8. For a weak acid HA, the percentage of dissociation is nearly 1% at equilibrium. If the concentration of acid is 0.1 mol L−1, then the correct option for its Ka​ at the same temperature is :2023 · Q90 · MCQ
  9. Kp for the following reaction is 3.0 at 1000 K. CO2(g) + C(s) ⇌ 2CO(g) What will be the value of Kc for the reaction at the same temperature? (Given : R = 0.083 L bar K−1 mol−1)2022 · Q127 · MCQ
  10. 3O2(g) ⇌ 2O3(g) for the above reaction at 298 K, Kc is found to be 3.0 × 10−59. If the concentration of O2 at equilibrium is 0.040 M then concentration of O3 in M is2022 · Q124 · MCQ
  11. Which one of the following conditions will favour maximum formation of the product in the reaction A2(g) + B2(g) ⇌ X2(g) , ΔrH = –X kJ ?2018 · Q107 · MCQ
  12. The equilibrium constants of the following are N2 + 3H2 ⇌ 2NH3; K1 N2 + O2 ⇌ 2NO; K2 H2 + 21​O2 ⇌ H2O; K3 The equilibrium constant (K) of the reaction : 2NH3 + ${5 \over…2017 · Q110 · MCQ
  13. A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume…2017 · Q112 · MCQ
  14. Consider the following liquid-vapour equilibrium. Liquid ⇌ Vapour Which of the following relations is correct ?2016 · Q106 · MCQ
  15. If the equilibrium constant for N2(g) + O2(g) ⇌ 2NO(g) is K, the equilibrium constant for 21​ N2(g) + 21​O2(g) ⇌ NO(g) will be2015 · Q98 · MCQ
  16. Which of the following statements is correct for a reversible process in a state of equilibrium?2015 · Q100 · MCQ
  17. If the value of equilibrium constant for a particular reaction is 1.6 × 1012, then at equilibrium the system will contain2015 · Q102 · MCQ
  18. Using the Gibb's energy change, ΔGo = +63.3 kJ, for the following reaction, Ag2CO3(s) ⇌ 2 Ag+(aq) + CO32− (aq) the Ksp of Ag2CO3(s) in water at 25oC is (R = 8.314 J K−1 mol−1)2014 · Q110 · MCQ
  19. For a given exothermic reaction, Kp and K'p are the equilibrium constants at temperatures T1 and T2, respectively. Assuming that heat of reaction is constant in temperature range between T1 and T2, it is readily observed that2014 · Q111 · MCQ
  20. For the reversible reaction, N2(g) + 3H2(g) ⇌ 2NH3(g) + heat The equilibrium shifts in forward direction2014 · Q112 · MCQ
  21. Given that the equilibrium constant for the reaction, 2SO2(g) + O2(g) ⇌ 2SO3(g) has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same…2012 · Q77 · MCQ
  22. Given the reaction between 2 gases represented by A2 and B2 to give the compound AB(g), A2(g) + B2(g) ⇌ 2AB(g) At equilibrium, the concentration of A2 = 3.0 × 10−3 M, of B2 = 4.2 × 10−3 M, of AB =…2012 · Q78 · MCQ
  23. The value of ΔH for the reaction X2(g) + 4Y2(g) ⇌ 2XY4(g) is less than zero. Formation of XY4(g) will be favoured at2011 · Q116 · MCQ
  24. For the reaction, N2(g) + O2(g) ⇌ 2NO(g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction, 2NO(g) + O2(g) ⇌ 2NO2(g) What is K for the reaction, NO2(g) ⇌…2011 · Q117 · MCQ
  25. The reaction, 2A(g) + B(g) ⇌ 3C(g) + D(g) is begun with the concentrations of A and B both at an initial value of 1.00 M. When equilibrium is reached, the concentration of D is measuread and found to be 0.25 M. The value…2010 · Q65 · MCQ
  26. In which of the following equilibrium Kc and Kp are not equal?2010 · Q128 · MCQ
  27. The dissociation constants for acetic acid and HCN at 25oC are 1.5 × 10−5 and 4.5 × 10−10 respectively. The equilibrium constant for the equilibrium CN− + CH3COOH ⇌ HCN + CH3COO− would be2009 · Q118 · MCQ
  28. The dissociation equilibrium of a gass AB2 can be represented as : 2AB2(g) ⇌ 2AB(g) + B2(g) The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with…2008 · Q114 · MCQ
  29. If the concentration of OH− ions in the reaction Fe(OH)3(s) ⇌ Fe3+(aq) + 3OH−(aq) is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increase by2008 · Q115 · MCQ
  30. The value of equilibrium constant of the reaction HI(g) ⇌ 21​H2(g) + 21​I2(g) is 8.0. The The equilibrium constant of the reaction H2(g) + I2(g) ⇌ 2HI(g) will be2008 · Q116 · MCQ
  31. The values of for the reactions, X ⇌ Y + Z . . . .(i) A ⇌ 2B . . . .(ii) are in the ratio 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (i) and (ii) are in…2008 · Q117 · MCQ
  32. The equilibrium constants of the following are N2 + 3H2 ⇌ 2NH3; K1 N2 + O2 ⇌ 2NO; K2 H2 + 21​O2 ⇌ H2O; K3 The equilibrium constant (K) of the reaction : 2NH3 + ${5 \over…2007 · Q100 · MCQ
  33. For the reaction : CH4(g) + 2O2(g) ⇌ CO2(g) + 2H2O(l), ΔHr = − 170.8 kJ mol−1. Which of the following statements is not true?2006 · Q120 · MCQ
  34. Equilibrium constants K1 and K2 for the following equilibriam: are related as Includes diagram2005 · Q116 · MCQ
  35. The equilibrium constants of the following are N2 + 3H2 ⇌ 2NH3; K1 N2 + O2 ⇌ 2NO; K2 H2 + 21​O2 ⇌ H2O; K3 The equilibrium constant (K) of the reaction : 2NH3 + ${5 \over…2003 · Q109 · MCQ
  36. The reaction quotient (Q) for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) is given by Q=[N2​][H2​]3[NH3​]2​. The reaction will proceed from right…2003 · Q120 · MCQ
  37. Reaction BaO2(g) ⇌ BaO(s) + O2(g); ΔH = +ve. In equilibrium condition, pressure of O2 depends on2002 · Q109 · MCQ
  38. For any reversible reaction, if we increase concentration of the reactants, then effect on equilibrium constant2000 · Q117 · MCQ
  39. Equilibrium constant Kp for following reaction MgCO3(s) ⇌ MgO(s) + CO2(g)2000 · Q118 · MCQ