Terms T&C. From Midterm Exam 2 : D. 173 g The most easily measurable form of energy comes in the form of heat, or enthalpy. C) K does not depend on the concentrations or partial pressures of reaction components. 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 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. N2 (g) + 3H2 (g) 2NH3 (g) 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. 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question The lightbulb is turned on for 0.015 h, and the assembly expands from an initial volume of 0.90 L to a final volume of 5.89 L against an external pressure of 1.0 atm] PDF Calculation the Equilibrium Constant - Oklahoma State University E. methanol, Give the major force between ethanol and water. How is vapor pressure related to temperature? (Hint: Start with calculating the pH as if this were a monoprotic acid.) What is the need of NCERT Solutions and CBSE MCQs? 11.90 Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. @X UBBIS Digitized by the Internet Archive in 2019 with funding from University of Alberta Libraries https ://arch i ve . D) 1.90 1019 [Like all equilibrium constants, the value of Kw depends on temperature. A. C. Ionic bond forces [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. Consider the following chemical reaction: H2 (g) + I2 (g) <> 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. 100 28) Which reaction will shift to the left in response to a decrease in volume? From Midterm Exam 2: C) N2 (g) + 2O2 (g) 2NO2 (g) Hydrogen and nitrogen react to form ammonia according to the following balanced chemical equation: \ce {3H2 (g) + N2 (g) <=> 2NH3 (g)} \nonumber Values of the equilibrium constant at various temperatures were reported as K_ {25C} = 3.3 \times 10^8, K_ {177C} = 2.6 \times 10^3, and K_ {327C} = 4.1. Oman, (+ Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? Netherlands, (+ Part C: Calculate the change in the internal energy of the system, E. The reaction mixture will contain [A]=1.0M and [B]=0.1M. What is the boiling point of water at an elevation of 1.00104 ft ? Guinea, (+ Calculate the standard enthalpy change for the reaction A. A. Albania, (+ Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. Nepal, (+ H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 ), [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. D) only products are present Finland, (+ E. In equilibrium, the ratio [P] / [A] is equal to k / k'. D. If the temperature is raised, then the reverse reaction is favored. Assume excess SiO2. [A solution contains a mixture of pentane and hexane at room temperature. 2HI leftharpoons H2 + I2 . Kp is - Tardigrade The solution has a vapor pressure of 245 torr . PPT PowerPoint Presentation (Methanol ( CH3OH ) contains hydrogen directly bonded to oxygen, so it has hydrogen bonding. A reversible reaction can proceed in both the forward and backward directions. . Additionally, the Online Multiple decision questions will give you certainty to show up in the board test and take care of the complicated issues quicker. C. 1.28 D) increase the value of the equilibrium constant 2) Which one of the following is true concerning the Haber process? 1.9 10-4 M C. -486 kJ corresponds to which redox cell reaction ? 971) 48.6 C A. adding SO3 (ii) The value of K decreases as the system approaches equilibrium. The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. Guinea, (+ A P B. D. 1, The equilibrium constant is given for two of the reactions below. E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 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. The osmotic pressures required for this process can be as high as 18.6 atm . United Kingdom, (+ E. 5.01 torr. 90) Bangladesh, (+ - A gas can be converted into a liquid by increasing the pressure of a gas sample. Note: Names of real elements have been changed to 'Xs' and 'Xo'. C) 6.44 105 South Africa, (+ 1) 64) E) 4 Fe (s) + 3 O2 (g) 2 Fe2O3 (s), 29) Which reaction will shift to the right in response to a decrease in volume? Here's an example. Part B: Calculate the boiling point of the solution above. South Korea, (+ We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. B. 7) Provide your answer in units of mol L-1. C) decrease the value of the equilibrium constant After the reaction reaches equilibrium, the total pressure is 2.65 atm.] The heat capacity of the calorimeter is 4.90 kJ/C. A. BF3 C. 2.8 10-5 M Which statement describes best the pH of a 0.010 M solution of this acid. A) some removal of from the reaction vessel (V and T constant) D. At any time, the ratio [P] / [A] is equal to k' / k. 3. Ghana, (+ Given: - A liquid can be converted to a gas by cooling. Or if any of the following reactant substances I2 (iodine), disappearing where n represents the stoichiometric coefficients] E. The equilibrium constant K as well as [A] and [A2] are unchanged. See Answer. 966) Guinea, (+ PDF Chapter 15 Practice Questions - umb.edu Bond Bond Energy (kJ/mol) Hungary, (+ You'll get a detailed solution from a subject matter expert that helps you learn core concepts. The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. B. Intramolecular forces Since there is not a viable alternative for it. C) roughly equal amounts of products and reactants are present 20) A. E. Xe. The equilibrium constant K will increase above 2.010-3 (answer is debatable), From Midterm Exam 2: H 2(g) +I 2(g) 2H I (g) Afghanistan, (+ We hope the given CBSE MCQs for Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12th all subjects will help you. HI(g)12H2(g)+12I2(g), The equilibrium constant is given for one of the reactions below. From Midterm 3: A. 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. 57.0 kJ 348) C. 16.6 kJ CH3Cl(g)+Cl2(g)CH2Cl2(g)+HCl(g), H=105.8 kJ, Use the standard reaction enthalpies given below to determine Hrxn for the following reaction: 2HI (g) = H2 (g) + I2 (g) Kp = 0.016 If 2.58 atm of HI (g) is sealed in a flask, what is the partial pressure of each gas. Q: At what temperature does benzene boil when the external pressure is 460 torr ? Consider the following reactions,(a) H2(g) + I2(g) 2HI(g)(b) CaCO2(s) CaO(s) + CO2(g)(c) S(s) + 3F2(g) SF6(g), The value of Kc for the reaction 2HI (g) H2 (g) + I2 (g) is 1 10^4 At a given time, the composition of reaction mixture is. These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. Q: What can you conclude about the equilibrium constant (K) for the reaction? 9.64 In each table, there may be one statement that is false because it contradicts the other three statements. 1.14 J/(g C) The total volume will change to half of the initial value at 1 bar. C. 22.1 kJ mol-1 Tajikistan, (+ Determine the value of the missing equilibrium constant. Q: Calculate the [H3O+] of this rain. 2SO3 (g) 2SO2 (g) + O2 (g) A. B. HPO42- C. The value of K remains, but the equilibrium is shifted towards more reactants. A. Maldives, (+ Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. A(g) + 2B(g) AB2(g) Kc = 59 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? Mauritius, (+ D) only products are present Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? Bahrain, (+ E. increase pressure, The following reaction is exothermic. 880) The equilibrium constant for the reaction H2+I2<->2HI is 54.8 at 425 Swaziland, (+ Qc = 0.120 < Kc reaction proceeds to products. Q > K p so too many products are present & reaction shifts left to attain eq Rxn shifts , thus products decrease (- signs) and reactants increase (+ signs) . B. SiH4 Hrxn= npHf(products) nrHf(reactants) CBSE MCQs lay a stronger foundation of concepts in students that can be useful for them in their later stages to prepare for any competitive exams. How can I download the CBSE MCQs in PDF Format for free? The equilibrium constant K will increase above 2.010-3. [Suppose that 1.10 g of rubbing alcohol (C3H8O)] Give the direction of the reaction, if K >> 1. D. The value of pH is somewhat lower than 2.13. 855) D. 1.85 233) C. 150 g United States, (+ 44) D. all of the above 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. Calculate the equilibrium constant for the following reaction at 25C: 233) E. All of these have intermolecular forces stronger than dispersion. To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. 2NH3 (g) N2 (g) + 3H2 (g) C) addition of some to the reaction vessel (V and T constant) B.54.4 J 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. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. 7) A reaction of the type 2A P has the following rate law: rate = k[A]2. 0.043 H2 (g) + I2 (g) 2HI (g) This buffer has a pH = 4.74. C-O 360 D) [SO3]2 / [SO2]2[O2]2 A) N2 (g) + 3H2 (g) 2NH3 (g) 0.269 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 ? C. 0.00048 B. a. B) 1.56 104 B. 25.0 g Ag, CAg = 0.235 J/gC 49) C) roughly equal amounts of products and reactants are present Thank you for your participation! It changes only with changes in temperature of the system. A. Bangladesh, (+ 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? 2CH3NO2(l)+3/2O2(g)2CO2(g)+3H2O(l)+N2(g) Hrxn = -1418 kJ] D. ion-dipole Zimbabwe. Bahrain, (+ C. 3.42 torr Georgia, (+ 380) A. E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? 100.0C HNO2 4.6104 E) only reactants are present, 22) The equilibrium constant for the gas phase reaction The equilibrium-constant expression depends on the _____ of the reaction. -333 kJ Download the Study24x7 App, so you can connect and collaborate. A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values. C) N2 (g) + 2O2 (g) 2NO2 (g) chemical equilibrium class-11 1 Answer +1 vote answered Feb 2, 2022 by Princebarnwal (34.9k points) selected Feb 6, 2022 by Jeewant Best answer For the given reaction, Kp = (pH I)2 (pH 2)(P I 2) ( p H I) 2 ( p H 2) ( P I 2) A. =1.33x10-3 M and [H+] = 1.33x10-3M The equilibrium constant, K eq, for the ionization of acetic acid at 25 C is _____. 358) Albania, (+ C) [H+][HCO3-] / [CO2][H2O] An analyte containing 0.12 L of a 0.025 M solution of a strong acid is titrated with a 0.220 M solution of a strong base. France, (+ - 1.92 x 103 kJ/mole C. HF C. 0.0010 E. 73.6 kJ, It takes 11.2 kJ of energy to raise the temperature of 145 g of benzene from 23.0C to 68.0C. 234) 230) 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. 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. 2 HD(g) H2(g) + D2(g) Kc = 0.28 Xs3+ + 3 e- Xs(s) : E = -0.55 V B. Russia, (+ Where to download CBSE MCQs for all Classes and Subjects? At equilibrium, ________. Saudi Arabia, (+ E) The reaction is at equilibrium when Q = Keq. 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). [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] Which statement is true at equilibrium? 880) Write an equilibrium constant expression b. United Arab Emirates, (+ Calculate Hrxn for the following reaction: 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. C) 0.020 For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the Q3. A) the quantities of reactants and . United States, (+ C. H3O+/OH- Cambodia, (+ Saudi Arabia, (+ Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. For a chemical equilibrium reaction H2 (g) + I2 (g) 2HI(g) write an expression for Kp (and relate it to Kc). but the same value of Kc will be obtained at a given temperature. (iii) The total pressure increases as the system approaches equilibrium. 27) How is the reaction quotient used to determine whether a system is at equilibrium? 2075 Exams . For both acid and base, 'strong' means fully dissociated. . 2.65 2A(g) + 2B(g) A2B2(g) Kc = 28.2. What is the best strategy while answering the Multiple Choice Questions for exams? 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: - A gas can be converted into a liquid by decreasing the pressure of a gas sample. Sweden, (+ 82) at a certain temperature. Q7. It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. Determine the value of . 93) Q: If a reaction mixture is initially 0.20 M in X, what is the concentration of X after 151 seconds? 44) is Keq = 3.6 10-3 at 999 K. At equilibrium, ________. E. All of the above are conjugate acid-base pairs. 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] 234) Denmark, (+ Calculate the change in pH after 15 mL of a 0.4 M solution of a strong base had been added to 100 mL of this buffer. E. +4087 J mol-1, From Midterm Exam 2: 224) Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. Tajikistan, (+ C. 5.25 J/(g C) Check all that apply. Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. Consider the equilibrium of two (ideal) gases according to 2A A2 with equilibrium constant K = 2.010-3 at a pressure of 1 bar and 30C. Xx+(aq) + e-(aq) Xx(s) , ..Keq = 6.2 x 10^2 230) 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? 32) Sweden, (+ B. A2 (g) 2 A (g). H2(g) + I2(g) 2HI(g) At equilibrium, the mixture is found to contain 1.580 mole of HI. 26) Which of the following statements is true? O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). Denmark, (+ Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. Two liquids, labeled A and B, form an ideal mixture with total vapor pressure P = 324.4 torr at a certain composition. A) [HF][H2O] / [H3O+][F-] E. 25.0 g Au, CAu = 0.128 J/gC, Calculate the change in internal energy (E) for a system that is giving off 25.0 kJ of heat and is changing from 18.00 L to 15.00 L in volume at 1.50 atm pressure. 82) At 100 C and 1 atm, water is in which phase? The NCERT Solutions for the questions are present on our site or you can find them online too. Spain, (+ You can likewise reconsider all Chemistry sections appropriately and save time during your group tests and tests. Enter the email address you signed up with and we'll email you a reset link. The law of ________ states that energy that can be neither created or destroyed. In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends What is NCERT Exemplar and where can we get its Solutions? Georgia, (+ 2COF2(g)CO2(g)+CF4(g), Kc=6.30 B. 45) B. C6H6 [The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK] 92) Answered: The statements in the tables below are | bartleby 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. Key points. Find the equilibrium amounts of these compounds if they all start out at 0.120 M. Solution: Determine Qc so that you know which direction the reaction will proceed. 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. Top 2 posts Page 1 of 1 The equilibrium constant for the formation of hydrogen iodide according to to given equation is K. H2 + I2 2HI Find the equilibrium constant in terms of K for the reaction: HI 1/2 H2 + 1/2 I2 Please explain. If you find. D. 0.117 M Daily act of different subject shrewd MCQs will assist with fostering a solid comprehension of every theme which you will recollect till date of your tests. The forward reaction is favored. C. State functions do not depend on the path taken to arrive at a particular state. 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. 355) E. 9.40, A mixture containing 20.6 g of ice (at exactly 0.00 C) and 70.3 g of water (at 62.9 C) is placed in an insulated container. E) only reactants are present, 24) The equilibrium constant for the gas phase reaction A. Xd + 2 H+ Xd2+ + 2 H2 - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. M. What is the half-life, t1/2, for this reaction in units of seconds ? 41) H2(g)+I2(g)2HI(g) Which of the following statement is/are true? 12.72 D. 32.2 kJ mol-1 These various decision inquiries for twelfth class Chemistry will help you to improve calculated and subject information abilities. C. 0.222 2SO2 (g) + O2 (g) 2SO3 (g) 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)? 234) HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). South Korea, (+ 91) E) 2N2 (g) + O2 (g) 2N2O (g), 31) In which of the following reactions would increasing pressure at constant temperature change the concentrations of reactants and products, based on Le Chteliers principle? 4.19 A. A galvanic cell designated as C. 12.28 Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Q: If the initial concentration of SO2Cl2 is 1.00 M, how long will it take for the concentration to decrease to 0.72 M ? H2 (g) + I2 (g)-- > < -- 2HI(g) H=-10.4 kJ. At body temperature (37C), Kw=2.41014] 351) Nepal, (+ H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? C) 2 SO3 (g) 2 SO2 (g) + O2 (g) E) decrease the partial pressure of CO, D) increase the value of the equilibrium constant, 34) Consider the following reaction at equilibrium. -4.56C [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. D. Intermolecular forces. A. [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] C. 55.8 C Rating: 5 / 5 stars. 37.5 g D) [NH3]2[H2Se] 268) The standard reduction potential for the nickel(II) ion is 0.26 V and that of the aluminum(III) ion is 1.66 V] Oman, (+ H2 + I2 = 2HI | Chemical Equation H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 South Africa, (+ 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. B) At equilibrium, the reaction quotient is undefined. Russia, (+ 4) Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? 20) 82) 230) E. 0.371, From Midterm Exam 2: 358) [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] y+4y+5y=26e3t,y0=1,y0=5.y^{^{\prime \prime }}+4y^{^{\prime - A gas can be converted into a liquid by heating. 30.5 C 9) The equilibrium expression for Kp for the reaction below is ________. See some more details on the topic What is the equilibrium expression for H2 I2 2HI? B) reactants predominate O=O 498 45) 48) 7.2 10-5 M C. N(g) \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) & \text { voltage }=-0.76 \mathrm{~V} C) roughly equal amounts of products and reactants are present C. 840 J 263) A. E. The value of pH is 2.13. C. dipole-dipole Ghana, (+ What is the osmotic pressure of this solution at 25 C? . 2. Consider the reaction: H2 (g) + 12 (9) ~ 2 HI (g) Kp = 92.6 MCQ Questions for Class 12 Chemistry Chapter 4 Chemical - CBSE MCQ Part A: What is the value of E for the combustion of the fuel?
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