Work, w, is the energy transferred when an object is caused to move a distance, d, against a force, F. Mathematically, we would write this as w=Fd. At equilibrium, ________. One of these substances is a liquid at room temperature. C) The reaction is at equilibrium when Q < Keq. C. K>1 D. 6.36 torr 224) Consider the chemical equation and equilibrium constant at 25C: Part C: Calculate the change in the internal energy of the system, E. C. remove reactant Understudies who are planning for serious assessments like NTSE, Olympiad, and so forth for class 12. 46) By rehearsing more second Year Chemistry MCQs with Answers Pdf Download, understudies can work on their speed and exactness which can help them during their board test. Xx+(aq) + e-(aq) Xx(s) , Q: What is the percent ionization of ammonia at this concentration? There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. C) roughly equal amounts of products and reactants are present What happens to the vapor pressure of a substance when the temperature is increased? A. adding SO3 B. NaCl 31) (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. - The vapor pressure of a liquid increases with increasing temperature. The equation for the dissociation of hypochlorous acid is: Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? 64) 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) 8) The equilibrium expression for Kp for the reaction below is ________. E. Xd + 2 H+ Xd2+ + H2. D. 456 kJ Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. 91) Note: Names of real elements have been changed to 'Xd'. Strong bonds break and weak bonds form. Which metal ion in the list is most difficult to reduce? - A gas can be converted into a liquid by heating. 32) Where to download CBSE MCQs for all Classes and Subjects? C. HF H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. B. H2SO3/HSO3- For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . Part A: Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. E. increase pressure, The following reaction is exothermic. 1) A) 5.71x104 B) 0.100 C) 1.75 x10-7 D) 1.79 x10-6 E) 5.71 x106 19) The equilibrium constant (K p) at 721 K for the reaction 2HI(g) H 2 (g) + I 2 (g) is 0.0198. C. 22.1 kJ mol-1 Netherlands, (+ From Midterm Exam 2: 0.043 Mexico, (+ E) The reaction is at equilibrium when Q = Keq. 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 250 mL sealed flask contains 0.65 g of butane at 22C.] Finland, (+ Q.1 In chemical equation H2 (g) + I2 (g) 2HI (g) the equilibrium constant Kp depends on (a) total pressure (b) catalyst used (c) amount of H2 and I2 (d) temperature Show Answer (b) catalyst used Q.2 If the rate of a reaction is expressed by, rate = A [A] [B], the order of reaction will be (a) 2 (b) 3 (c) 1 (d) 0 Show Answer (b) 3 A. Egypt, (+ E) shift the equilibrium to the right, D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture, Chemistry: Chapter 13 Review: Properties of S, CHAPTER 17: ADDITIONAL ASPECTS OF AQUEOUS EQU. D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. D) only products are present 41) 27) Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. D. The value of K remains, but the equilibrium is shifted towards more products. C. 840 J A. B) H2 (g) + Cl2 (g) 2 HCl (g) 2 NO (g) N2 (g) + O2 (g). 64) (iii) The total pressure increases as the system approaches equilibrium. B. increase volume Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Georgia, (+ A -253 C. The reaction mixture will contain equal concentrations of A and B. [An aqueous solution contains 32% HCl by mass] [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. Denmark, (+ [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. 27) B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. E) only reactants are present. Here's an example. Netherlands, (+ 17.9 A homogeneous equilibrium reaction exists when all the components of the reaction are in the same phase (i.e., gas, liquid, solid, aqueous). B. [Nickel and aluminum electrodes are used to build a galvanic cell. C. 0.00048 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. B) Keq does not change with temperature, whereas Q is temperature dependent. A. E. -1.35C. 2A(g) + 2B(g) A2B2(g) Kc = 28.2. E. All of the above are true. B. 100.0C A) 25 C. 150 g D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. For these conditions, what is the value of Kp for the reaction that occurred: Q: What is the mole fraction of hexane? E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? 44) The most easily measurable form of energy comes in the form of heat, or enthalpy. Determine the partial pressure of each gas at equilibrium. E) in the presence of solid carbon, 35) The effect of a catalyst on an equilibrium is to ________. The formation of HI from H2 and I2 is an example of gaseous homogeneous equilibrium reaction. D. Energy is neither created nor destroyed, excluding nuclear reactions. 855) Afghanistan, (+ B. 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. Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. C) [SO3]2 / [SO2]2[O2] Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. Hungary, (+ While the crate is moving, the ramp exerts a constant frictional force on it that has magnitude 65.0N65.0 \mathrm{~N}65.0N. (a)(a)(a) What is the total work done on the crate during its motion from the bottom to the top of the ramp? 355) B. hydrogen bonding B. A. NH4+/NH3 D. ion-dipole Utilizing the assets accessible you can score well in the test. C. 1.28 [The total change in internal energy is the sum of the heat, q, and work, w: E=q+w] the sign of E for the system: negative (-) = The system expands and the surroundings get hotter positive (+) = The system contracts and the surroundings get colder Which of the following is TRUE if E sys = - 115 J? At equilibrium, ________. - The vapor pressure of a liquid decreases with increasing temperature. A. Saudi Arabia, (+ The symbols have their usual meaning, for example AG stands for the standard Gibbs free energy of reaction and K stands for the equilibrium constant. A. The total volume will change to half of the initial value at 1 bar. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. India, (+ It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. 2 Xs(s) + 3 Xn2+(aq) 2 Xs3+(aq) + 3 Xn(s) . O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. Note: Names of real elements have been changed to 'Xs' and 'Xo'. 0.13 M C. 4.3 M D. 0.039 M 2SO3 (g) 2SO2 (g) + O2 (g) (Assume ideal behavior.). The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? Consider a cell that is built using the following two half-reactions, 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. NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. B. The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). 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. Decreased? 4) Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. B) [SO2] / [SO3] B) at high temperature and low pressure CH3NC(g) CH3CN(g) C) N2 (g) + 2O2 (g) 2NO2 (g) In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. Mauritius, (+ C) 1 / [(NH4)2Se] Poland, (+ To calculate Kp, you first need to know the partial pressures of each gas in a mixture, then you simply put the partial pressure values into the equation you worked out earlier. B) a decrease in the total pressure (T constant) A. Mauritius, (+ B -423 B) It is a process used for the synthesis of ammonia. is Kp = 7.0. A. A galvanic cell designated as Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). E. +4087 J mol-1, From Midterm Exam 2: A. 44) Q: Calculate mole fraction of the solution. 0.093 M What is dynamic equilibrium? 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. Zimbabwe, (+ Identify the change that will always shift the equilibrium to the right. 971) Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? 2NO(g)N2(g)+O2(g)Kp=2.11030 What is the value of Keq for the following reaction? South Africa, (+ C. 1.92 x 103 kJ/mole 48.6 C HI(g)12H2(g)+12I2(g), The equilibrium constant is given for one of the reactions below. The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. B. The osmotic pressures required for this process can be as high as 18.6 atm . Suppose 0.811 mol of HI is placed in a 1.50-L container at 500 K. What is the equilibrium concentration of H2 (g)? H2(g) + I2(g) 2HI(g) At equilibrium, the mixture is found to contain 1.580 mole of HI. Turkey, (+ @X UBBIS Digitized by the Internet Archive in 2019 with funding from University of Alberta Libraries https ://arch i ve . E) only reactants are present, 23) The equilibrium constant for the gas phase reaction C. The reciprocal concentration, [A]-1, changes linearly with time. A. From Midterm 3: A) [H+][HCO3-] / [CO2] mmmmmmmH2 + mmlI2 mll2HI I/molL-1:ml1.000mm1.000mml1.000 C/molL-1:mm-xmmmll-xmmml+2x E/molL-1:m1.000-xm1.000-xm1.000+2x C) K does not depend on the concentrations or partial pressures of reaction components. E. 42.7 g. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] E. -117 kJ. At body temperature (37C), Kw=2.41014] [A solution contains a mixture of pentane and hexane at room temperature. 92) 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. E. 5.01 torr. Maldives, (+ - The relationship between vapor pressure and temperature is linear. B) [CO2] / [H+][HCO3-] Each question has four options followed by the right answer. is Keq = 3.6 10-3 at 999 K. At equilibrium, ________. 7154 Spain, (+ Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25 C. These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. is Keq = 4.34 10-3 at 300 C. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] From Midterm Exam 2: For a process at constant pressure, 49,600 calories of heat are released. 2 HBr(g) H2(g) + Br2(g) Kc = ? E. none of the above. Tajikistan, (+ D. C2H3O2-/HC2H3O2 A) products predominate Catalysts have no effect on equilibrium situations. What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 31 C ? - A gas can be converted into a liquid by increasing the pressure of a gas sample. A. K<1 [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] This reaction has been started at time t = 0 with an initial concentration of [A]0 = 0.3 M, with a half-life t1/2 = 131 s. What concentration of A is present at time t = 258 s ? What state transition or transistions occur in carbon dioxide if you begin with a sample of carbon dioxide at 60.0 C at 50.0 atm and warm the sample to 10.0 C and 50.0 atm? C. +115 kJ H2 (g) + Br2 (g) 2 HBr (g) Zimbabwe. Egypt, (+ Denmark, (+ The equilibrium constant K p is independent of (A) Total pressure (B) Catalyst (C) The amounts of H 2 and I 2 present However, it changes with Temperature 44) [Acid rain over the Great Lakes has a pH of about 4.6.] Which one statement regarding the first-order reaction HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). E. The equilibrium constant K as well as [A] and [A2] are unchanged. Albania, (+ . Pakistan, (+ [Consider these two acids and their Ka values: 2HI(g); Equilibrium is the exact balancing of two opposing processes. A closed vessel at 400 K is charged with 1.00 atm of Br2 (g), 1.00 atm of Cl2 (g), and 2.00 atm of BrCl (g). Use the following data: From Midterm 3: A) products predominate 1.9 10-4 M 995) When a reactio. You can get ready really for the Class 12 Chemistry Exam as they assist you with being comfortable with the sort of inquiries showing up in the test. Kc depends on how the chemical equation is written, but not on how the reaction is carried out. B) N2 (g) + O2 (g) 2NO (g) D. 39.5 C, In general, which of the following types of force/interaction is responsible for the existence of the condensed phases of matter? User Agreement,Privacy Policy D. CO - A gas can be converted into a liquid by cooling. at a certain temperature. A) increase the rate of the forward reaction only A) [SO3] / [SO2][O2] Nepal, (+ (R = 0.0821 L atm/ (K mol)) A. - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. A. Calculate the equilibrium constant for the following reaction at 25C: India, (+ Switzerland, (+ C. 2.8 10-5 M By using Laplace transforms, solve the following differential equations E. -91 kJ, Identify an element that is NOT in its standard state. Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? E. 8.89. Equilibrium constant Kp is equal to the partial pressure of products divided by partial pressure of reactants and the partial pressure are raised with some power which is equal to the coefficient of the substance in balanced equation. Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. From Midterm 3: From Midterm Exam 2: C) roughly equal amounts of products and reactants are present Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. 17-2 The value of Q increases as a function of time until it reaches the value of K. b) No, Q would still increase with time because the [I2] would decrease in exactly the same way as [H2] decreases. 351) C. Neither direction is favored. is Keq = 2.80 102 at 999 K. At equilibrium, ________. N2(g) + O2(g) 2 NO(g) Hrxn = +183 kJ 48) Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. (Hint: Start with calculating the pH as if this were a monoprotic acid.) Bahrain, (+ B. D. TP and CP are always at the same pressure. South Korea, (+ - A liquid can be converted to a gas by heating. France, (+ Nigeria, (+ The law of ________ states that energy that can be neither created or destroyed. }}+5y=26e^{3t},~~~~~y_{0}=1,~y_{0}^{^{\prime }}=5. C-H 414 What is the vapor pressure of propane at 20.0 C? A) N2O4 (g) 2NO2 (g) A compound is found to have a molar mass of 598 g/mol. B. B. C. OH- Yes, our website is the one-stop search for all CBSE Board Examination related sources like questions papers, syllabus, exam pattern, sample papers, and Multiple choice questions papers. Portugal, (+ Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. Br2 (g) + Cl2 (g) 2BrCl (g) A) N2 (g) + 3H2 (g) 2NH3 (g) A) some removal of from the reaction vessel (V and T constant) After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. E) [F-] / [HF], 19) The expression for for the reaction below is ________. 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. 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question Which statement describes best the pH of a 0.010 M solution of this acid. Enter the email address you signed up with and we'll email you a reset link. Switzerland, (+ 33) 233) What is the standard free energy change (Grxn) for this reaction? C. -2.97C Assume excess SiO2. D) increase the value of the equilibrium constant What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? A. D. 173 g Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? Reaction rates but not the rate constants k and k' depend on temperature. 90) 230) Note: Names of real elements have been changed to 'Xx' and 'Xa'. United States, (+ E. -24.5 kJ, Calculate the amount of heat (in kJ) required to raise the temperature of a 79.0 g sample of ethanol from 298.0 K to 385.0 K. The specific heat capacity of ethanol is 2.42 J/gC. Finland, (+ When a liquid evaporates in a closed container, molecules with relatively higher kinetic energy escape the liquid surface into the vapour phase and number of liquid molecules from the vapour phase strike the liquid surface and are retained in the liquid phase. Use the bond energies provided to estimate Hrxn for the reaction below. - 1.92 x 103 kJ/mole Q: How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration? B. Ukraine, (+ B. Intramolecular forces B. Hrxn can be determined using constant pressure calorimetry. Check all that apply. D. increase reactant 31) Finland, (+ The solution has a vapor pressure of 245 torr . A. -2.16C C. 2.13 10-14 B. [The reaction X products is second order in X and has a rate constant of 0.035 M1s1] The rate constant for the reaction is 9.45 10-5 s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s. From Midterm 3: 92) A reaction of the type 2A P has the following rate law: rate = k[A]2. Bangladesh, (+ B. Rating: 5 / 5 stars. You can likewise reconsider all Chemistry sections appropriately and save time during your group tests and tests. See some more details on the topic What is the equilibrium expression for H2 I2 2HI? - The vapor pressure of a liquid increases with increasing temperature. By rehearsing more second Year Chemistry MCQs with Answers Pdf Download, understudies can work on their speed and precision which can help them during their board test. From Midterm Exam 2 : C. The bonds that break and those that form are of approximately the same strength. Write an equilibrium constant expression b. For a chemical equilibrium reaction H2 (g) + I2 (g) 2HI(g) write an expression for Kp (and relate it to Kc). B. density 37.5 g Swaziland, (+
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