971) A. F2 [Acid rain over the Great Lakes has a pH of about 4.6.] Initially, the vessel contains only X2 at a pressure of 1.75 atm. 0.556 230) A(g) + 2B(g) AB2(g) Kc = 59 1.14 J/(g C) Formation of HI from H2 and I2 - Equilibrium constants in terms of E. +4087 J mol-1, From Midterm Exam 2: Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. Top 2 posts Page 1 of 1 What is the best strategy while answering the Multiple Choice Questions for exams? B. Hrxn can be determined using constant pressure calorimetry. So, visit our site and easily find MCQs for all subjects classwise. Portugal, (+ C. Ionic bond forces There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. If the value for K = 2.1 X10-2 at 730 K, which substance predominates, HI or H2 and I2 Xn2+ + 2 e- Xn(s) : E = 1.33 V 45) +206 kJ Essentt - Handpicked Products. Nigeria, (+ Donald A. McQuarrie, Ethan B Gallogly, Peter A Rock, Edward Atkins, Julio de Paula, Peter Atkins. [The half-life for the radioactive decay of U238 is 4.5 billion years and is independent of initial concentration] The best strategy to follow while answering the MCQ Questions for exams is to go through the question as many times as possible and understand it clearly. 224) Spain, (+ A) the quantities of reactants and . 2.30 View Answer Consider the following reaction: 2SO (g) + O_2 (g) to 2SO_2 (g) K_p = 36.4 at 298 K. In a reaction mixture at equilibrium, the partial pressure of SO is 0.46 atm and that of SO_2 is. C. raising the temperature Determine the value of the missing equilibrium constant. Which of the following statements is TRUE? Portugal, (+ 268) A. 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. After 203 s the concentration of A had fallen to one fifth of the initial value. 2NH3 (g) N2 (g) + 3H2 (g) C) decrease the value of the equilibrium constant Understudies who are getting ready for designing and clinical selection tests like NEET, IIT JEE, AIIMS, JIPMER and SAT Exams in Chemistry. 11.90 Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? 7) A. 263) D. 5.50 10-14 [The reaction X products is second order in X and has a rate constant of 0.035 M1s1] D. Energy is neither created nor destroyed, excluding nuclear reactions. 1/2 N2(g) + O2(g) NO2(g) Hrxn = +33 kJ D) Q does not depend on the concentrations or partial pressures of reaction components. Substance Hf (kJ/mol) What is the boiling point of water at an elevation of 1.00104 ft ? H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant C) slow the reverse reaction only H2 (g) + I2 (g) <------------------> 2 HI (g) 2SO3 (g) 2SO2 (g) + O2 (g) What happens to the vapor pressure of a substance when the temperature is increased? We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. B. Answered: The statements in the tables below are | bartleby E. All of the above are conjugate acid-base pairs. Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. Egypt, (+ - The vapor pressure of a liquid increases with increasing temperature. Hydrogen iodide undergoes decomposition according to the equation 2HI (g) H2 (g) + I2 (g) The equilibrium constant Kp at 500 K for this equilibrium is 0.060. Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is lower than the rate of the reverse reaction. E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? [Consider these two acids and their Ka values: Belgium, (+ You'll get a detailed solution from a subject matter expert that helps you learn core concepts. A. adding SO3 966) B. Which one? Let's flip the above reaction. HF (aq) + H2O (l) H3O+ (aq) + F- (aq) Which statement describes best the pH of a 0.010 M solution of this acid. B) increase the equilibrium constant so that products are favored H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. Part A: Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. The equilibrium-constant expression depends on the _____ of the reaction. NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. India, (+ 45) VITEEE 2007: For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the equilibrium constant Kp changes with (A) total pressure (B) catalyst (VITEEE 2007: For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the equilibrium constant Kp changes with (A) total pressure (B) catalyst (Tardigrade - CET NEET JEE Exam App. Netherlands, (+ D. 1-butanol Part B: Calculate the boiling point of the solution above. Test - Regents The pH of a solution of boric acid, H3BO3(aq), with Ka = 5.410-10 has been found to have a value of 5.02. Rehearsing NCERT Online Chemistry Objective Questions For Class 12 Pdf Answers is perhaps the most ideal way to plan for the CBSE Class 12 board test. A. H 2(g) +I 2(g) 2H I (g) A. Tajikistan, (+ The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: B) It is a process used for the synthesis of ammonia. B. removing O2 C. K>1 This equilibrium is an exothermic one. E. -91 kJ, Identify an element that is NOT in its standard state. PDF Chapter 17 Equilibrium: the Extent of Chemical Reactions Hungary, (+ 355) CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions. Here you will find NCERT MCQ Questions for Class 12 Chemistry with Answers PDF Free Download based on the important concepts and topics given in the textbook.This may assist you to understand and check your knowledge about the chapters. 973) To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? Consider the following reactions and their respective equilibrium constants: 0.269 D. increase reactant The standard reduction potential for the nickel(II) ion is 0.26 V and that of the aluminum(III) ion is 1.66 V] Elements of Chemical Reaction Engineering Fifth edition.pdf [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. This quantity of heat is equivalent to: information you need to know about E for the system, [The total change in internal energy is the sum of the heat, q, and work, w: E=q+w]. D. +473 kJ C. 0.322 M 351) Xd(s) | Xd2+(aq) || H+(aq) | H2(g) | Pt D. H3PO4 What is the rate constant, k, for this reaction in units of L mol-1 s-1. Russia, (+ [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] 41) What is the value of Keq at this temperature for the following reaction? D. 13.16 One of these substances is a liquid at room temperature. The equilibrium constant K will increase above 2.010-3 (answer is debatable), From Midterm Exam 2: E) [F-] / [HF], 19) The expression for for the reaction below is ________. Ti (s) + 2Cl2 (g) TiCl4 (l) If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25C, what is the osmotic pressure of the resulting solution? Q: Calculate the molality of the solution. Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. but the same value of Kc will be obtained at a given temperature. Consider the chemical equation and equilibrium constant at 25C: Turkey, (+ B. C6H6 A. B. density C. 0.222 E. -1.35C. Is Why I2 H2 A Explain A And Gas Is Solid - mon.confael.lazio.it E) 2 Fe2O3 (s) 4 Fe (s) + 3O2 (g), 30) Based on Le Chtelier's principle, increasing pressure at constant temperature in the following reaction will not change the concentrations of reactants and products. 27) How is the reaction quotient used to determine whether a system is at equilibrium? 3. with forward (A P) rate constant k and reverse (A P) rate constant k' is correct? 268) E. methanol, Give the major force between ethanol and water. At equilibrium the total pressure in the container is 1.300 atm. 34) 2075 H2(g) +I2(g) 2HI(g) Using the Equilibrium Constant (cont) E.g.2 For the reaction: PCl5(g) PCl3(g) + Cl2(g), Kc = 0.800 M at 340oC. A. C) [SO3]2 / [SO2]2[O2] 2A(g) + 2B(g) A2B2(g) Kc = 28.2. Hydrogen bonding is a strong intermolecular force that makes this substance a liquid at room temperature), Identify the term used to describe the ability of a liquid to flow against gravity up a narrow tube. . 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question Provide your answer in units of coulombs (C). If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium? How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? The Kc constant shows that the ratio of products to reactants is very small, indicating that a much higher concentration of reactants exists compared to the concentration of products. Which statement is true of an endothermic reaction? A) some removal of from the reaction vessel (V and T constant) A) [SO3] / [SO2][O2] Finland, (+ The reaction mixture will contain [A]=1.0M and [B]=0.1M. 100 Ag+(aq)+eAg(s)Co2+(aq)+2eCo(s)Cu2+(aq)+2eCu(s)Pb2+(aq)+2ePb(s)Zn2+(aq)+2eZn(s)voltage=+0.80Vvoltage=0.28Vvoltage=+0.34Vvoltage=0.13Vvoltage=0.76V. Zimbabwe, (+ New Zealand, (+ [Nickel and aluminum electrodes are used to build a galvanic cell. E) in the presence of solid carbon, 35) The effect of a catalyst on an equilibrium is to ________. B. HPO42- A. H2(g) A. 41) 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? C. Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction equals the rate of the reverse reaction. Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. 07: Equilibrium / Chemistry Part-I - philoid.com Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as gaining heat from the surroundings? E) an increase in total pressure by the addition of helium gas (V and T constant), B) a decrease in the total pressure (T constant), 33) Consider the following reaction at equilibrium: +1251 J mol-1 B. E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? Write an equilibrium constant expression b. The most easily measurable form of energy comes in the form of heat, or enthalpy. 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . A) 25 [Suppose that 1.10 g of rubbing alcohol (C3H8O)] 2CH3NO2(l)+3/2O2(g)2CO2(g)+3H2O(l)+N2(g) Hrxn = -1418 kJ] K, start subscript, start text, c, end text, end subscript. D. 12.9 kJ 8) The equilibrium expression for Kp for the reaction below is ________. - A gas can be converted into a liquid by increasing the pressure of a gas sample. C) N2 (g) + 2O2 (g) 2NO2 (g) A) [HF][H2O] / [H3O+][F-] (iii) The total pressure increases as the system approaches equilibrium. - A gas can be converted into a liquid by heating. What is the vapor pressure of propane at 20.0 C? For a process at constant pressure, 49,600 calories of heat are released. [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position.