B. 7) The equilibrium constant K (article) | Khan Academy 1) B. Maldives, (+ CBSE MCQs for all the classes and subjects are provided online or you can view them on our site. -4.56C C. 150 g D. 6.36 torr C. 62.5C 32) Ukraine, (+ For the equilibrium of the dissociation reaction of the compound 'A2', the concentrations were found to be [A2] = 0.022 M and [A] = 0.13 M at 25C: B -423 What is NCERT Exemplar and where can we get its Solutions? H2 + I2 = 2 HI Since there is an equal number of each element in the reactants and products of H2 + I2 = 2HI, the equation is balanced. 100.0C B. CP is always at a higher temperature relative to TP. The people who need to get the passing marks in the CBSE class twelfth board test can use the Chemistry Multiple choice requests to practice. E. -117 kJ. What is the rate constant, k, for this reaction in units of L mol-1 s-1. Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. Which statement applies to the equilibrium of this reaction after the pressure is changed to 2 bar, but with the temperature remaining at 30C ? Hungary, (+ Which change will shift the equilibrium to the left? Bahrain, (+ C. 50.0 g Al, CAl = 0.903 J/gC Rehearsing NCERT Online Chemistry MCQ Questions for Class 12 with Answers is perhaps the most effective way to plan for the CBSE Class 12 board test. D) N2 (g) + 3H2 (g) 2NH3 (g) D. 456 kJ What is the vapor pressure of propane at 25.0 C? D. TP and CP are always at the same pressure. 07 H2(g) Nonmetal Gas 2 00 L container and goes to equilibrium at 200 oC 00 L container and goes to equilibrium at 200 oC. 48.6 C E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. C. Ionic bond forces Test - Regents From Midterm Exam 2: Le Chtelier's principle predicts that a decrease in temperature will ________. b. Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. The equilibrium constant expression for the reaction is Kc = [HI]2 [H2][I2] Substituting the equilibrium concentrations into the equilibrium expression, Kc = (0.30)2 (0.012)(0.15) = 50 The magnitude of the equilibrium constant is 50 for the temperature at which the data was collected. From Midterm 3: is given by, 21) The equilibrium constant for the gas phase reaction Write an equilibrium constant expression b. The concentration [A] was measured at two different times: at t1 = 19.4 s the concentration of A was [A]1 = 0.62 M and at time t2 = 60.8 s the result was [A]2 = 0.31 The molar mass of sugar is 342.3 g/mol. Sweden, (+ ..Keq = 6.2 x 10^2 . D) 1.90 1019 The most easily measurable form of energy comes in the form of heat, or enthalpy. Given: A. increase product C) 7.07 2HI = H2 + I2 | Chemical Equation See Answer. Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is higher than the rate of the reverse reaction. It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. (iii) The total pressure increases as the system approaches equilibrium. B) [(NH4)2Se] / [NH3]2[H2Se] New Zealand, (+ After equilibrium was reached, the partial pressure of NO dropped to 320 torr. The equilibrium-constant expression depends on the _____ of the reaction. Albania, (+ So Kp = (PH2) x (PI2) / PHI^2 P = partial pressure E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. 2SO2 (g) + O2 (g) 2SO3 (g) United Kingdom, (+ 2NH3 (g) N2 (g) + 3H2 (g) Poland, (+ Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. C. 0.037 Equilibrium constant expression in terms of partial pressures E. +4087 J mol-1, From Midterm Exam 2: Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. Q: What is the pH of a 0.240 M ammonia solution? 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. 224) D. 0.420 . Xx+(aq) + e-(aq) Xx(s) , Swaziland, (+ B. 44) 0.21 M B. Strong bonds break and weak bonds form. For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends subject to the given initial conditions. 20) Consider the chemical equation and equilibrium constant at 25C: H2 (g)+I2 (g)2HI (g) , K=6.2102 Calculate the equilibrium constant for the following reaction at 25C: HI (g)12H2 (g)+12I2 (g) For these conditions, what is the value of Kp for the reaction that occurred: After 203 s the concentration of A had fallen to one fifth of the initial value. A.1.89 103 J E) The reaction is at equilibrium when Q = Keq. E. All of these have intermolecular forces stronger than dispersion. H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 3. B. Xd + 2 H+ 2 Xd+ + H2 C. -486 kJ For a chemical equilibrium reaction H2(g) + I2(g) 2HI(g) Q: What is the mass of the silver block? here: 2HI the concentration at equilibrium is H2=I2=HI=4mol/dm D. Intermolecular forces. Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. C. 16.6 kJ M. What is the half-life, t1/2, for this reaction in units of seconds ? (ii) The value of K decreases as the system approaches equilibrium. A) at high temperature and high pressure Which of the following is NOT a conjugate acid-base pair? The equilibrium constant (K ) would be __________. All reactant and product concentrations are constant at equilibrium. Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Pocket (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on Skype (Opens in new window), Click to share on WhatsApp (Opens in new window), General Principles and Processes of Isolation of Elements Class 12 MCQ Questions, The p-Block Elements Class 12 MCQ Questions, The d-and f-Block Elements Class 12 MCQ Questions, Coordination Compounds Class 12 MCQ Questions, Haloalkanes and Haloarenes Class 12 MCQ Questions, MCQ Questions for Class 12 Chemistry Chapter 1 The Solid State with Answers, MCQ Questions for Class 12 Chemistry Chapter 2 Solutions with Answers, MCQ Questions for Class 12 Chemistry Chapter 3 Electrochemistry with Answers, MCQ Questions for Class 12 Chemistry Chapter 5 Surface Chemistry with Answers, MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers, MCQ Questions for Class 12 Chemistry Chapter 7 The p-Block Elements with Answers, MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements with Answers, MCQ Questions for Class 12 Chemistry Chapter 9 Coordination Compounds with Answers, MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers, Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download. The forward reaction is favored. Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. 973) Even though metal is a good conductor, frost can be seen on parked cars in the early morning even when the air temperature is above freezing. H2(g)+I2(g)2HI(g) , K=6.2102 Give the direction of the reaction, if K >> 1. 1/2 N2(g) + O2(g) NO2(g) Hrxn = +33 kJ A. PO43- C. -16.0 kJ A) 5.4 10-13 31) E) The reaction will go to completion since there are equal amounts of Br2 and Cl2. Assume excess SiO2. Germany, (+ Q: How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration? C) slow the reverse reaction only United States, (+ The amounts of H 2 and I 2 present D Temperature Medium Solution Verified by Toppr Correct option is D) The equilibrium constant does not change at all with changes in concentrations, volume, pressure, presence of catalyst, etc. Determine the value of . Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . 1 Answer Ernest Z. Dec 11, 2017 The equilibrium concentrations are: [H2] = [I2] = 0.681 mol/L [HI] = 2.362 mol/L Explanation: The balanced equation is H2 + I2 2HI Now, we can set up an ICE table. Georgia, (+ PPT PowerPoint Presentation Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. 2HI (g) H2 (g) + I2 (g) A) 100 B) 0.50 C) 0.020 D) 2500 E) -50 C) 0.020 13) The Keq for the equilibrium below is 50. A. H2(g) 50.0 g Cu, CCu = 0.385 J/gC \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) & \text { voltage }=-0.76 \mathrm{~V}
