0.21 M B. 234) 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 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 . B. The reaction mixture will contain [A]=1.0M and [B]=0.1M. 1.9 10-4 M B) 1 / [HF] B.54.4 J 26) Which of the following statements is true? Q: Calculate mole fraction of the solution. What factors cause changes between the liquid and gas state? D. capillary action (Methanol ( CH3OH ) contains hydrogen directly bonded to oxygen, so it has hydrogen bonding. D) 2500 The equilibrium constant for the reaction H2+I2<->2HI is 54.8 at 425 C. -2.97C 4) Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? From Midterm 3: Determine the value of the missing equilibrium constant. C. 1.92 x 103 kJ/mole 3. B. Intramolecular forces C) N2 (g) + 3H2 (g) 2 NH3 (g) A) [H+][HCO3-] / [CO2] (i) The value of K increases as the system approaches equilibrium. Check all that apply. 966) E. The value of pH is 2.13. By using Laplace transforms, solve the following differential equations The equilibrium constant K will increase above 2.010-3. b. CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) Equilibrium hydrogen is defined as a sample of hydrogen existing at the equilibrium ratio of orthohydrogen-parahydrogen at a given temperature (shown by the crimson dash-dot line in the figure). E. CP is always at a lower temperature relative to TP. 995) 0.13 M C. 4.3 M D. 0.039 M 0.556 Hydrogen iodide can decompose into hydrogen and iodine gases. 2HI (g 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? Nigeria, (+ The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: +1251 J mol-1 D. 173 g 2003-2023 Chegg Inc. All rights reserved. B) It is a process used for the synthesis of ammonia. Given: - A gas can be converted into a liquid by cooling. Albania, (+ In a particular experiment, the partial pressures of H 2 and I 2 Saudi Arabia, (+ Zimbabwe, (+ United Kingdom, (+ Consider the first-order decomposition of compound A according to C) decrease the value of the equilibrium constant 33) 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. What is the best strategy while answering the Multiple Choice Questions for exams? 93) C. 1.94 (ii) The value of K decreases as the system approaches equilibrium. What is the osmotic pressure of this solution at 25 C? is Keq = 2.80 102 at 999 K. At equilibrium, ________. 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. corresponds to which redox cell reaction ? 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? E) only reactants are present. A) Q does not change with temperature. Initially, the vessel contains only X2 at a pressure of 1.75 atm. D. 1, The equilibrium constant is given for two of the reactions below. 82) A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. A. 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) 0.183 \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ 7) D. The value of pH is somewhat lower than 2.13. 34) C. Neither direction is favored. 1) E) -50, 13) The Keq for the equilibrium below is 50. 358) Which one statement regarding the first-order reaction A. viscosity Turkey, (+ 7154 Xx+(aq) + e-(aq) Xx(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? Which of the following statements is TRUE? [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. H2 (g) + I2 (g) <------------------> 2 HI (g) Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. 52) CBSE Class 10 Answered - TopperLearning C) 2 SO3 (g) 2 SO2 (g) + O2 (g) 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. [An aqueous solution contains 32% HCl by mass] 28.4 kJ A. Finland, (+ C. N2 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]. 45) is given by, 21) The equilibrium constant for the gas phase reaction These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. 48) The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. E. In equilibrium, the ratio [P] / [A] is equal to k / k'. B. 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ The isomerization of methylisonitrile to acetonitrile Use the bond energies provided to estimate Hrxn for the reaction below. Note: Names of real elements have been changed to 'Xd'. Poland, (+ D. 1.2 Solved Consider the chemical equation and equilibrium | Chegg.com Provide an explanation. A. Germany, (+ 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. This multitude of MCQs with answers are delivered by subject specialists for a wide range of understudies. Each question has four options followed by the right answer. Belgium, (+ In chemical equation H2 (g) + I2 (g) 2HI (g) the equilibrium constant Kp depends on See more A total pressure B catalyst used C amount of H2 and I2 D Temperature Submit Class 12 (PCB) Class 12 (PCM) Like Comment Share Write a comment 500+ more Questions to answer Popular Courses FREE How to start preparing for IIT from Class 10th 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. 82) A. D) [SO3]2 / [SO2]2[O2]2 E) [H+][HCO3-], 18) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 224) 12.30 What is the mole fraction xA of liquid A in this mixture. D. ion-dipole H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 B. A. Erxn can be determined using constant volume calorimetry. [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] A. The NCERT Solutions for the questions are present on our site or you can find them online too. CBSE MCQs for all the classes and subjects are provided online or you can view them on our site. 992) . 2. Consider the reaction: H2 (g) + 12 (9) ~ 2 HI (g) Kp = 92.6 977) -69.8 J mol-1 Both TP and CP are located on the solid/liquid phase boundary. 4.19 India, (+ 233) +206 kJ In chemical equation H2 (g) I2 (g) 2HI (g) the equilibrium constant Exams . Business, Finance, Economics, Accounting, Operations Management, Computer Science, Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical . H2 (g) + I2 (g) HI (g) D) a decrease in the total volume of the reaction vessel (T constant) Portugal, (+ D. Intermolecular forces. Solution Verified by Toppr Correct option is D) For the reaction, H 2(g)+I 2(g)2HI(g), the number of moles of gaseous reactants is equal to the number of moles of gaseous products. E. There is not enough information to calculate the Kw. Use the following reactions and given H values. B. PDF Calculation the Equilibrium Constant - Oklahoma State University At body temperature (37C), Kw=2.41014] Q: What is the mole fraction of hexane? Top 2 posts Page 1 of 1 [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The total volume will change to half of the initial value at 1 bar. 348) C. 5.25 J/(g C) Which statement applies to the equilibrium of this reaction after the pressure is changed to 2 bar, but with the temperature remaining at 30C ? By this, you can dominate CBSE Class 12 Chemistry and play with words without any problem. \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ A. A) products predominate N2(g)+O2(g)+Br2(g)2NOBr(g). In each table, there may be one statement that is false because it contradicts the other three statements. Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? A. A. Strong bonds break and weak bonds form. 12.72 230) After 203 s the concentration of A had fallen to one fifth of the initial value. is first order in CH3NC. Half-reaction reaction potentials you might need are: 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: How is vapor pressure related to temperature? is Keq = 4.34 10-3 at 300 C. E) [NH3]2[H2Se] / [(NH4)2Se], 17) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? The reaction mixture will contain [A]=0.1M and [B]=1.0M. United States, (+ D. -0.91C 263) 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. Bangladesh, (+ a. A. Explain this phenomenon, keeping in mind that sound is reflected from the surface of the water and that the temperature of the air just above the water's surface is usually less than that at a height of 10m10 \mathrm{~m}10m or 20m20 \mathrm{~m}20m above the water. The equilibrium constant (K ) would be __________. 992) Switzerland, (+ A) The reaction quotient must be satisfied for equilibrium to be achieved. D) only products are present 968) The most easily measurable form of energy comes in the form of heat, or enthalpy. South Africa, (+ C. 3.42 torr [Suppose that 1.10 g of rubbing alcohol (C3H8O)] This problem has been solved! What is the need of NCERT Solutions and CBSE MCQs? C. 0.222 Nigeria, (+ C. 840 J A. 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. Utilizing the assets accessible you can score well in the test. C) The reaction is at equilibrium when Q < Keq. B. Example: 4.00 moles of HI are placed in an evacuated 5.00 L flask and then heated to 800 K. The system is allowed to reach What will be the equilibrium concentration of each species? Egypt, (+ E. 0.169 M, From Midterm Exam 2: It will assist you with knowing regardless of whether your arrangement is continuing the correct way. E. H3O+. D. Nothing can be concluded about K from Ecell. A galvanic cell designated as 880) 2) Which one of the following is true concerning the Haber process? For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . Sweden, (+ United Arab Emirates, (+ HF (aq) + H2O (l) H3O+ (aq) + F- (aq) C) [H3O+][F-] / [HF][H2O] H2+I2----> 2HI equilibrium shift - CHEMISTRY COMMUNITY Q2. Calculate the standard enthalpy change for the reaction but the same value of Kc will be obtained at a given temperature. E. -117 kJ. Tajikistan, (+ What is the value of Keq for the following reaction? E. The reverse reaction is favored. 380) When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. 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. here: 2HI the concentration at equilibrium is H2=I2=HI=4mol/dm 44) E. Xd + 2 H+ Xd2+ + H2. A 250 mL sealed flask contains 0.65 g of butane at 22C.] B. A) [SO3] / [SO2][O2] Which statement is true at equilibrium? C 185 Note: Names of real elements have been changed to 'Xx' and 'Xa'. For H2O, Hfus = 6.01 kJ/mol, and Hvap = 40.67 kJ/mol. CH4(g)+2Cl2(g)CH2Cl2(g)+2HCl(g) At the same temperature, pure liquid A has a vapor pressure of 220 torr, while pure liquid B has a vapor pressure of 400 torr. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? E. All of the above are true. B) Keq does not change with temperature, whereas Q is temperature dependent. 348) 46) 32) 48.6 C Cambodia, (+ Swaziland, (+ CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. Oman, (+ 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? C. 16.6 kJ D. -150. kJ B. H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . 8) The equilibrium expression for Kp for the reaction below is ________. 52) Pakistan, (+ Equilibrium Constant Kp Definition And Examples - Chemistry Dictionary B) [(NH4)2Se] / [NH3]2[H2Se] B. Mexico, (+ (Assume ideal behavior.). Another example of a chemical equation that can be used to explain is given below: Equation: 2 S O 2 ( g) + O 2 ( g) 2 S O 3 ( g) Equilibrium Constant: K C = [ S O 3] 2 [ S O 2] 2 [ O 2] Moreover, in terms of finding equilibrium constant for gases, partial pressure is taken into account. Compute the pH at 25C after 3 mL of the base has been added. Energy can be transferred in many ways, one of which is in the form of work. Which change will shift the equilibrium to the left? Part A: What is the value of E for the combustion of the fuel? Ghana, (+ At equilibrium, ________. for the following reaction at 25C: HI(g)12H2(g)+12I2(g), The given reaction is NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. D. 456 kJ 224) E) in the presence of solid carbon, 35) The effect of a catalyst on an equilibrium is to ________. You can utilize the quick links on our page to view or download the CBSE MCQs of all classes in an easy way. B) reactants predominate United Kingdom, (+ 41) C. 1-pentanol D. 12.9 kJ C. State functions do not depend on the path taken to arrive at a particular state. Asked by sumandeesinghrana | 12 Oct, 2010, 03:00: PM Expert Answer Dear Student For the reaction H 2 + I 2 --------> 2HI Provide your answer in units of coulombs (C). H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. NO(g)+12Br2(g)NOBr(g)Kp=5.3 A. 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} You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. Part B: What is the value of H for the combustion of the fuel? A. D. 0.087 4CuO (s) + CH4 (g) CO2 (g) + 4Cu (s) + 2H2O (g), 20) The equilibrium-constant expression for the reaction 880) It changes only with changes in temperature of the system. What is the vapor pressure of propane at 25.0 C? (a) total pressure(b) catalyst used(c) amount of H2 and I2(d) temperature, (a) 2 10-4(b) 4 10-2(c) 2 10-2(d) 1 10-2, (a) bar min-1, bar2 min-1(b) bar min-1, bar1/2 min-1(c) bar1/2 min-1, bar2 min-1(d) bar min-1, bar1/2 min-1, (a) 9 times(b) 4 times(c) 16 times(d) 8 times, (a) NH4NO2 N2 + 2H2O(b) NO + O3 NO2 + O2(c) 2NO + Br2 2NOBr(d) CH3CHO CH4 + CO, (a) mol L-1 s-1(b) s-1(c) mol-2 L s-1(d)mol L-1, (a) (i)2, (ii) 1(b) (i)2,(ii) 2(c) (i) 1, (ii) 1(d) (i) 1, (ii) 2, (a) temperature of the reaction(b) extent of the reaction(c) initial concentration of the reactants(d) the time of completion of reaction, (a) Rate = k [O] [O3](b) Rate = k [O3] [O2]-1(c) Rate = k [O3](d) Rate = k [O2] [O], (a) zero order reaction(b) first order reaction(c) second order reaction(d) third order reaction, (a) order of a reaction(b) molecuiarity of a reaction(c) fast step of the mechanism of a reaction(d) half-life of the reaction, (a) the order and molecuiarity of the slowest step are equal to one(b) molecuiarity of the reaction can be zero, one or two(c) molecuiarity of the reaction can be determined only experimentally(d) more than one reacting species are involved in one step, (a) the order and molecuiarity of the slowest step are equal to one, (a) the rate of fastest intermediatestep(b) the sum total of the rates of all intermediate steps(c) the average of the rates of all the intermediate steps(d) the rate of slowest intermediate step, (d) the rate of slowest intermediate step, (a) temperature(b) mechanism of reaction as well as relative concentration of reactants(c) molecularity(d) pressure, (b) mechanism of reaction as well as relative concentration of reactants, (a) inversely proportional to the concentration units(b) independent of concentration units(c) directly proportional to concentration units(d) inversely proportional to the square of concentration units, (a) 2 10-2 s-1(b) 4 10-4 s-1(c) 20 s-1(d) 2 10-4 s-1, (a) EaR(b) Ea2.303R(c) 2.303Ea.R(d) Ea2.303, (a) mol L-1s-1(b) s-1(c) L mol-1s-1(d) L2mol-2s-1, (a) triple(b) increase by a factor of 4(c) double(d) remain unchanged.