The law of ________ states that energy that can be neither created or destroyed. Substance Hf (kJ/mol) Which statement is true of an endothermic reaction? Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Albania, (+ 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? B. D. 1, The equilibrium constant is given for two of the reactions below. 92) 44) United States, (+ B) H2 (g) + Cl2 (g) 2 HCl (g) A. ion-ion A. H2(g) - A gas can be converted into a liquid by cooling. b. a. B. C6H6 1.72 There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. A 43.9-g piece of copper (C_Cu= 0.385 J/gC) at 135.0C is plunged into 254 g of water at 39.0C. A. 2075 What is the vapor pressure of propane at 25.0 C? The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. Note: Names of real elements have been changed to 'Xx' and 'Xa'. C. The value of pH is 6.65. What is the primary source of water stored in an aquifer? CBSE MCQs for all the classes and subjects are provided online or you can view them on our site. D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture C=O 799 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)? B. B. and D. -150. kJ The equilibrium constant is given for one of the reactions below. D. Nothing can be concluded about K from Ecell. C) 0.020 You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. B. A. Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. A. K<1 Hydrogen iodide can decompose into hydrogen and iodine gases. Determine the value of the missing equilibrium constant. In chemical equation H2(g) + I2(g) 2HI (g), the equilibrium Kp depends on (a) total pressure (b) catalyst used (c) amount of H2 and I2 (d) temperature class-12 Please log in or register to answer this question. What is the value of Keq for the following reaction? [Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 C] A. E. +4087 J mol-1, From Midterm Exam 2: XaO4-(aq) + 4 H+(aq) + 3 e-(aq) XaO2(s) + 2 H2O(l) . B.54.4 J C. The bonds that break and those that form are of approximately the same strength. Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. C. 3.42 torr At 100 C and 1 atm, water is in which phase? From Midterm 3: Calculate the standard cell potential, Ecell, for the cell defined by the reaction C) The reaction is at equilibrium when Q < Keq. Given: For a process at constant pressure, 49,600 calories of heat are released. 855) +1251 J mol-1 0.13 M C. 4.3 M D. 0.039 M 224) A) 5.4 10-13 234) [The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK] 0.556 F 2100 universal tv remote manual ethanol is capable of forming hydrogen bonds with water good breakfast cereal for type 2 diabetes naturally with diet Of the three basic states of matter, the particles in gas are much . Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] ), [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. N2(g) + O2(g) 2 NO(g) Hrxn = +183 kJ . [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] Mexico, (+ United States, (+ 2SO2 (g) + O2 (g) 2SO3 (g) A reversible reaction can proceed in both the forward and backward directions. A. Q6. D. CO Turkey, (+ C. -486 kJ 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? Poland, (+ What is the osmotic pressure of this solution at 25 C? The isomerization of methylisonitrile to acetonitrile CH4(g)+Cl2(g)CH3Cl(g)+HCl(g), H=99.60 kJ From Midterm 3: 9) The equilibrium expression for Kp for the reaction below is ________. 355) 2 HD(g) H2(g) + D2(g) Kc = 0.28 E) only reactants are present. Part B: Calculate the boiling point of the solution above. -4.56C 263) Egypt, (+ B) reactants predominate B. Xd + 2 H+ 2 Xd+ + H2 Oman, (+ 992) 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. A. 995) 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 B. 977) The gases react to form l-l] according to the equation above. A) products predominate 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . Give the direction of the reaction, if K >> 1. Nepal, (+ A) 2HI (g) H2 (g) + I2 (g) 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. -69.8 J mol-1 Ghana, (+ 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]. The heat of vaporization of the alcohol at 25 C is 45.4 kJ/mol, the specific heat of aluminum is 0.903 J/gC. C. raising the temperature A. A. Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. (iii) The total pressure increases as the system approaches equilibrium. B) 1 / [HF] Saudi Arabia, (+ E. 53.1C, The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1C to 65.3C? 10 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] C) 6.44 105 [Consider these two acids and their Ka values: A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. D) only products are present C. OH- 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 people who need to get the passing marks in the CBSE class twelfth board test can use the Chemistry Multiple choice requests to practice. A) [SO3] / [SO2][O2] 2 NO (g) N2 (g) + O2 (g). 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 To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. 7) 90) Hrxn= npHf(products) nrHf(reactants) 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. - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. India, (+ B. The amount of 2.62 mol of a sugar is added to 1.64 kg of pure water at standard pressure. Bangladesh, (+ A galvanic cell designated as D) 2HI (g) H2 (g) + I2 (g) 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. C) at low temperature and low pressure H2(g) + I2(g) 2HI(g) At equilibrium, the mixture is found to contain 1.580 mole of HI. Determine the value of . C) K does not depend on the concentrations or partial pressures of reaction components. [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] B. The value of pH is somewhat higher than 6.65. B. The reaction : N 2O4 2N O2 J & K CET 2018 8. - 1.92 x 103 kJ/mole B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? E. In equilibrium, the ratio [P] / [A] is equal to k / k'. +206 kJ 52) See Answer. A. C) roughly equal amounts of products and reactants are present [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? C-O 360 4.19 E) Q is the same as Keq when a reaction is at equilibrium. 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. E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question 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: [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] Penguins??] A) [NH3][H2Se] / [(NH4)2Se] A. When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. C. The reciprocal concentration, [A]-1, changes linearly with time. Bahrain, (+ Pakistan, (+ 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. Le Chtelier's principle predicts that a decrease in temperature will ________. C) 7.07 - A gas can be converted into a liquid by increasing the pressure of a gas sample. 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. O=O 498 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. 3) Which one of the following will change the value of an equilibrium constant? E) all of the above, 32) Consider the following reaction at equilibrium: 92) (look up carbon dioxide phase diagram), Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? C. 0.222 Q: What is the pH of a 0.240 M ammonia solution? A B + C 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. Check all that apply. system remains constant during its change from Examples:- (i) H2(g) + I2(g) 2HI(g) the initial to final state. D. 1.72 J/(g C), The temperature rises from 25.00C to 29.00C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. 348) B) At equilibrium, the reaction quotient is undefined. -2.16C A -253 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. Refer to the list of electrode potentials below to answer parts a to d. Ag+(aq)+eAg(s)voltage=+0.80VCo2+(aq)+2eCo(s)voltage=0.28VCu2+(aq)+2eCu(s)voltage=+0.34VPb2+(aq)+2ePb(s)voltage=0.13VZn2+(aq)+2eZn(s)voltage=0.76V\begin{array}{ll} D -511. - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Which statement is true at equilibrium? 968) One of these substances is a liquid at room temperature. Guinea, (+ E. 0.371, From Midterm Exam 2: A) decrease the partial pressure of O2 (g) A. Ti (s) + 2Cl2 (g) TiCl4 (l) Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . 380) D) 1.90 1019 A. Erxn can be determined using constant volume calorimetry. 31) (i) The value of K increases as the system approaches equilibrium. 855) - A liquid can be converted to a gas by heating. B. Consider the chemical equation and equilibrium constant at 25C: Sweden, (+ By clicking Agree & join, you agree to the Study24x7 1) A. viscosity D. If the temperature is raised, then the reverse reaction is favored. D) 2500 Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. A. F2 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. Energy can be transferred in many ways, one of which is in the form of work. Br2 (g) + Cl2 (g) 2BrCl (g) Determine the value of the missing equilibrium constant. Cambodia, (+ 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. E. Xe. 968) If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. 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. E. The value of pH is 2.13. D. ion-dipole 233) B) N2O4 (g) 2NO2 (g) A. 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) C. 12.28 B. Hrxn can be determined using constant pressure calorimetry. Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. B. Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. Phenomenon after H2 (hydrogen) reacts with I2 (iodine) This equation does not have any specific information about phenomenon. Ukraine, (+ D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. D. 40.5C 32) E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Q: How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration? A) at high temperature and high pressure What is the vapor pressure of propane at 20.0 C? D) [H3O+][F-] / [HF] H2(g)+I2(g)2HI(g) , K=6.2102 If the value for K = 2.1 X10-2 at 730 K, which substance predominates, HI or H2 and I2 Science Chemistry For the following reaction, 2HI(g) --> H2(g) + I2(g) a. 20) D. 1-butanol C. 0.037 where n represents the stoichiometric coefficients] Which of the following is TRUE if E sys = - 115 J? 48.6 C 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. 100.0C A reaction of the type 2A P has the following rate law: rate = k[A]2. Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. When the equilibrium constant is written with the gases in terms of partial pressure, the equilibrium constant is written as the symbol K_\text p K p. The subscript p stands for penguins. 2NH 3 (g) N 2 . 11.90 South Africa, (+ Xx+(aq) + e-(aq) Xx(s) , Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. B) the rates of the forward and reverse reactions are equal. B) at high temperature and low pressure . 995) 992) 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) 233) A2B(g) + B(g) A2B2(g) Kc = 16.4 C. 50.0 g Al, CAl = 0.903 J/gC 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] Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? He(g) 0.81 1) 5.99 torr Georgia, (+ Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. 64) D. 4.60. 82) For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . Exams . B) 1.56 104 8) The equilibrium expression for Kp for the reaction below is ________. After 203 s the concentration of A had fallen to one fifth of the initial value. E) [NH3]2[H2Se] / [(NH4)2Se], 17) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? Nepal, (+ Q: What can you conclude about the equilibrium constant (K) for the reaction? A) products predominate What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? Understudies who are getting ready for designing and clinical selection tests like NEET, IIT JEE, AIIMS, JIPMER and SAT Exams in Chemistry. Pakistan, (+ Note: Names of real elements have been changed to 'Xs' and 'Xo'. y+4y+5y=26e3t,y0=1,y0=5. 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. 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. B. A. subject to the given initial conditions. D. increase reactant Saudi Arabia, (+ 880) E. 1.62. 0.183 For H2O, Hfus = 6.01 kJ/mol, and Hvap = 40.67 kJ/mol. NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. Each question has four options followed by the right answer. D. 5.50 10-14 Cambodia, (+ A. - The relationship between vapor pressure and temperature is linear. (Pg.5) (c) Isobaric process:- An isobaric process is In a homogeneous equilibrium, all the defined as one in which the pressure of the reactants and products are in the same phase. 960) Poland, (+ C. 0.0010 C. 22.1 kJ mol-1 C. 840 J 4CuO (s) + CH4 (g) CO2 (g) + 4Cu (s) + 2H2O (g), 20) The equilibrium-constant expression for the reaction C) 2 SO3 (g) 2 SO2 (g) + O2 (g) We reviewed their content and use your feedback to keep the quality high. 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. After equilibrium was reached, the partial pressure of NO dropped to 320 torr. C. Ionic bond forces United Kingdom, (+ South Korea, (+ It can be represented as. Russia, (+ 2.34 10-7 Germany, (+ B) reactants predominate Use the following data: 2NO2 (g) 2NO (g) + O2 (g) Which one statement regarding the first-order reaction In this case, you just need to observe to see if product substance HI (hydroiodic acid), appearing at the end of the reaction. [Acid rain over the Great Lakes has a pH of about 4.6.] Oman, (+ 351) C. H3O+/OH- Hungary, (+ A. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 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. Q7. From Midterm 3: 348) Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. Swaziland, (+ D. 0.420 C) [H3O+][F-] / [HF][H2O] +25.5 kJ H2 (g) + I2 (g) 2HI (g) B. D. 12.9 kJ For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction 82) E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 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. The statements in the tables below are about two different chemical equilibria. Portugal, (+ 52) All the Solutions are explained in a comprehensive manner and are recommended by many subject experts. 49) C) [H+][HCO3-] / [CO2][H2O]