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. Understudies who are planning for serious assessments like NTSE, Olympiad, and so forth for class 12. Rating: 5 / 5 stars. Pakistan, (+ 0.233 M 224) E) [H+][HCO3-], 18) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? From Midterm 3: (Remember that 101.3 J = 1 L atm) 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. C. +873 J mol-1 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]. 968) [An aqueous solution contains 32% HCl by mass] 348) 2HI = H2 + I2 | Chemical Equation. B) the rates of the forward and reverse reactions are equal. B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. Q: What is the [H3O+] in pure water at body temperature? For a process at constant pressure, 49,600 calories of heat are released. -1282 kJ What is the value of Keq for the following reaction? A. Consider the chemical equation and equilibrium constant at 25C: A) 100 B. A reversible reaction can proceed in both the forward and backward directions. D. 5.50 10-14 E) Q is the same as Keq when a reaction is at equilibrium. 82) 44) }}+5y=26e^{3t},~~~~~y_{0}=1,~y_{0}^{^{\prime }}=5. Nepal, (+ E. none of the above. 82) 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? +1251 J mol-1 C) The reaction is at equilibrium when Q < Keq. Q: What is the half-life for this reaction? Georgia, (+ E) Q is the same as Keq when a reaction is at equilibrium. 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. 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. What is the boiling point of water at an elevation of 1.00104 ft ? If you have any queries regarding The Solid State CBSE Class 12 Chemistry MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon. Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). 2) Which one of the following is true concerning the Haber process? Denmark, (+ 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. [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] Use the following data: A. (iii) The total pressure increases as the system approaches equilibrium. Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. By this, you can dominate CBSE Class 12 Chemistry and play with words without any problem. 966) B) at high temperature and low pressure A. Part B: If the butane is warmed to 25 C, how much liquid butane is present? is Keq = 230 at 300 C. A. 52) K, start subscript, start text, c, end text, end subscript. 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? C. dipole-dipole What is the value of Keq for the following reaction? From Midterm 3: D. 456 kJ B. India, (+ H2 (g) + I2 (g) 2HI (g) 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. 5.99 torr A second-order reaction of the type 2A P was carried out in a solution with the initial concentration of A being [A]0 = 1.5 mol L-1. -4.56C E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? 7) 91) 44) C) N2 (g) + 2O2 (g) 2NO2 (g) Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. B. C) roughly equal amounts of products and reactants are present In chemical equation H2(g) + I2(g)2HI (g) the equilibrium constant Kpdepends onSee more. 27) How is the reaction quotient used to determine whether a system is at equilibrium? 1.9 10-4 M D. 0.087 Poland, (+ Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. 268) 358) The heat capacity of the calorimeter is 4.90 kJ/C. here: 2HI the concentration at equilibrium is H2=I2=HI=4mol/dm New Zealand, (+ Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. [Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 C] D) 1.90 1019 A 20.0kg20.0 \mathrm{~kg}20.0kg crate sits at rest at the bottom of a 15.0m15.0 \mathrm{~m}15.0m long ramp that is inclined at 34.034.0^{\circ}34.0 above the horizontal. Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. B. removing O2 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. -25.5 kJ D. 12.9 kJ Finland, (+ 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. ..Keq = 6.2 x 10^2 (NH4)2Se (s) 2NH3 (g) + H2Se (g) D. CH3OH, D. CH3OH 7154 A. B. 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. In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. C) at low temperature and low pressure Provide your answer in units of mol L-1. Q: Which acid is stronger? What is the vapor pressure of propane at 25.0 C? with forward (A P) rate constant k and reverse (A P) rate constant k' is correct? When a reactio. (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. 2.65 Finland, (+ B) a decrease in the total pressure (T constant) 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. H 2(g) +I 2(g) 2H I (g) H2(g)+I2(g)2HI(g) Which of the following statement is/are true? 880) Russia, (+ B) [(NH4)2Se] / [NH3]2[H2Se] For the reaction given in Part A, how much heat is absorbed when 2.80 mol of A reacts? D.2.08 10-2 J E) in the presence of solid carbon, 35) The effect of a catalyst on an equilibrium is to ________. 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 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. Br2 (g) + Cl2 (g) 2BrCl (g) B. 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ a. D) increase the value of the equilibrium constant 968) Both TP and CP are located on the solid/liquid phase boundary. From Midterm 3: Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. Determine the value of the missing equilibrium constant. B. H2SO3/HSO3- Given: \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ 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? One of these substances is a liquid at room temperature. 34) Sweden, (+ Here's an example. 973) 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. 91) Since there is not a viable alternative for it. Q: What is the mole fraction of hexane? Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. C) 7.07 NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. The equilibrium-constant expression depends on the _____ of the reaction. E. increase pressure, The following reaction is exothermic. 9) The equilibrium expression for Kp for the reaction below is ________. C. 16.6 kJ A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. [The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK] 7) Chemistry MCQ For Class 12 Chapter astute with Answers PDF Download. D. 5.11 1-propanol 57.0 kJ Denmark, (+ South Africa, (+ Denmark, (+ A) products predominate B) reactants predominate Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. The amount of 2.62 mol of a sugar is added to 1.64 kg of pure water at standard pressure. 11.90 Maldives, (+ D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) 977) 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ B) 0.50 C. 0.222 C) slow the reverse reaction only The value of pH is somewhat higher than 2.13. Afghanistan, (+ 28.4 kJ Isotonic saline solution, which has the same osomotic pressure as blood, can be prepared by dissolving 0.923 g of NaCl in enough water to produce 100. mL of solution. Nigeria, (+ C=O 799 A. Chemistry MCQ For Class 12 Chapter savvy with answers Online Test is a sort of Mock Test that will assist you with taking care of the few issues of Std twelfth NCERT Chemistry Books. D. Xd + H+ Xd2+ + H2 + Pt E) none of the above, 12) The Keq for the equilibrium below is 50. The osmotic pressures required for this process can be as high as 18.6 atm . B) It is a process used for the synthesis of ammonia. 64) 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. E) only reactants are present, 22) The equilibrium constant for the gas phase reaction 855) E) all of the above, 32) Consider the following reaction at equilibrium: 230) C. 1.94 41) PART A: C. N(g) Which metal ion in the list is most difficult to reduce? - A gas can be converted into a liquid by decreasing the pressure of a gas sample. A. This equilibrium is an exothermic one. D. 0.117 M 46) 7) A. 355) 20) C. -2.97C NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. D) only products are present United Kingdom, (+ Guinea, (+ Cambodia, (+ 2NH3 (g) N2 (g) + 3H2 (g) Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? D. all of the above [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] C) decrease the value of the equilibrium constant Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. 973) Bahrain, (+ Using the equilibrium constant calculated in 2, calculate . C. +115 kJ E. The equilibrium constant K as well as [A] and [A2] are unchanged. E) only reactants are present, 23) The equilibrium constant for the gas phase reaction \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\ You can utilize the quick links on our page to view or download the CBSE MCQs of all classes in an easy way. C) 0.020 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. A2B(g) + B(g) A2B2(g) Kc = 16.4 E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? is Keq = 2.80 102 at 999 K. At equilibrium, ________. B. hydrogen bonding - A liquid can be converted to a gas by heating. The system is losing 115 J, while the surroundings are gaining 115 J, A. energy associated with the temperature of an object, D. energy associated with the motion of an object, D. energy associated with the position or composition of an object. HF (aq) + H2O (l) H3O+ (aq) + F- (aq) Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.] 37.5 g Mauritius, (+ E) [F-] / [HF], 19) The expression for for the reaction below is ________. C) 6.44 105 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. y+4y+5y=26e3t,y0=1,y0=5. Q: If a reaction mixture is initially 0.20 M in X, what is the concentration of X after 151 seconds? (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. - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. United Kingdom, (+ Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? South Korea, (+ Understudies who wish to hone their insight into Chemistry. 263) So Kp = (PH2) x (PI2) / PHI^2 P = partial pressure C) [H+][HCO3-] / [CO2][H2O] 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 ? D) [NH3]2[H2Se] Which statement is true at equilibrium? . What is the stoichiometric coefficient of Xx(s) in the balanced reaction equation for that cell ? 49) A. E. 8.89. The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. Enter the email address you signed up with and we'll email you a reset link. 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. New Zealand, (+ From Midterm Exam 2: Determine the value of the missing equilibrium constant. Egypt, (+ Exams . C. The reaction mixture will contain equal concentrations of A and B. Tajikistan, (+ 0.556 A. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: N2(g) + O2(g) 2 NO(g) Hrxn = +183 kJ 960) 90) Portugal, (+ D. TP and CP are always at the same pressure. A) 25 A. Compute the pH at 25C after 3 mL of the base has been added. where n represents the stoichiometric coefficients] - A gas can be converted into a liquid by cooling. D. H3PO4 - A liquid can be converted to a gas by heating. 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). 2A(g) + B(g) A2B(g) Kc = ? A. viscosity B. CP is always at a higher temperature relative to TP. Which one? C. 0.322 M You'll get a detailed solution from a subject matter expert that helps you learn core concepts. It can be represented as. The forward reaction is favored. Cambodia, (+ E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 20) HC2H3O2 1.8105] 2SO2 (g) + O2 (g) 2SO3 (g) 2075 Provide your answer in units of coulombs (C). B -423 C) 1 / [(NH4)2Se] 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 happens to the vapor pressure of a substance when the temperature is increased? A) [SO3] / [SO2][O2] See some more details on the topic What is the equilibrium expression for H2 I2 2HI? A) products predominate Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. B. E. 1.62. Strong bonds break and weak bonds form. Q: What is the mass of the silver block? Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. United States, (+ Belgium, (+ 93) d. Which metal ion in the list is the easiest to reduce? A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. 1) C. The value of K remains, but the equilibrium is shifted towards more reactants. - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. South Africa, (+ From Midterm 3: 2 NO(g) + O2(g) ' 2 NO2(g) The equilibrium constant (K ) would be __________. H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant Q: How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration? Equilibrium constant expression in terms of partial pressures Sn(s)|Sn2+(aq)NO(g)|NO3(aq),H+(aq)|Pt(s), 3Sn(s)+2NO3(aq)+8H+(aq)3Sn2+(aq)+2NO(g)+4H2O(l), [Use tabulated half-cell potentials to calculate Grxn for each of the following reactions at 25 C] Key points. E) only reactants are present, 24) The equilibrium constant for the gas phase reaction 2A(g) + 2B(g) A2B2(g) Kc = 28.2. 0.81 2.34 10-7 4CuO (s) + CH4 (g) CO2 (g) + 4Cu (s) + 2H2O (g), 20) The equilibrium-constant expression for the reaction By clicking Agree & join, you agree to the Study24x7 What is the best strategy while answering the Multiple Choice Questions for exams? B) At equilibrium, the reaction quotient is undefined. H2 (g) + Br2 (g) 2 HBr (g) South Korea, (+ H2 (g) + I2 (g) 2HI (g) C. 3.42 torr Russia, (+ 230) 3. B. How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? Donald A. McQuarrie, Ethan B Gallogly, Peter A Rock, Edward Atkins, Julio de Paula, Peter Atkins. [Seriously? O=O 498 (R = 0.0821 L atm/ (K mol)) A. B) [SO2] / [SO3] C) N2 (g) + 3H2 (g) 2 NH3 (g) D) only products are present We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. Essentt - Handpicked Products. 2NO2 (g) 2NO (g) + O2 (g) B. Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. Give the direction of the reaction, if K >> 1. The reaction : N 2O4 2N O2 J & K CET 2018 8. Hrxn= npHf(products) nrHf(reactants) France, (+ After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. 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? HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). E. 0.371, From Midterm Exam 2: 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. [The reaction X products is second order in X and has a rate constant of 0.035 M1s1] [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] D. The value of pH is somewhat lower than 2.13. C) [SO3]2 / [SO2]2[O2] - 1.92 x 103 kJ/mole Weak bonds break and strong bonds form. . D. SiF4 C. 1-pentanol The most easily measurable form of energy comes in the form of heat, or enthalpy. y+4y+5y=26e3t,y0=1,y0=5.y^{^{\prime \prime }}+4y^{^{\prime B. Let's flip the above reaction. 233) Spain, (+ E. 13.02, From Midterm Exam 2: C. 150 g C. State functions do not depend on the path taken to arrive at a particular state. A. 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). A P 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 ? 0.269 B. - The vapor pressure of a liquid decreases with increasing temperature. 34) Which statement is true of an endothermic reaction? C) roughly equal amounts of products and reactants are present Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. Mauritius, (+ D. 6.36 torr A. Afghanistan, (+ 27) C. The bonds that break and those that form are of approximately the same strength. Albania, (+ Note: Names of real elements have been changed to 'Xx' and 'Xa'. A reaction of the type 2A P has the following rate law: rate = k[A]2. The isomerization of methylisonitrile to acetonitrile Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. E. 0.169 M, From Midterm Exam 2: B) reactants predominate Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? Or if any of the following reactant substances I2 (iodine), disappearing D. 1.85 B) reactants predominate Turkey, (+ Q: Calculate the [H3O+] of this rain. (b)(b)(b) How much time does it take the crate to travel to the top of the ramp? B) H2 (g) + Cl2 (g) 2 HCl (g) \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ Strong bonds break and weak bonds form. Albania, (+ H2(g)+I2(g)2HI(g) , K=6.2102 Consider a cell that is built using the following two half-reactions, B. D) [H3O+][F-] / [HF] A) increase the rate of the forward reaction only Q2. To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. D. The value of K remains, but the equilibrium is shifted towards more products. Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. Q6. H2 (g) + I2 (g) HI (g) C. 840 J D. - 1.23 x 103 kJ/mole. Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture France, (+ Nepal, (+ XaO4-(aq) + 4 H+(aq) + 3 e-(aq) XaO2(s) + 2 H2O(l) . [Like all equilibrium constants, the value of Kw depends on temperature. 91) 233) 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. Where to download CBSE MCQs for all Classes and Subjects? 28) Which reaction will shift to the left in response to a decrease in volume? 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). A. 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: NO(g)+12Br2(g)NOBr(g)Kp=5.3 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. Spain, (+ C. 0.037 32) C. 12.28 48) [The half-life for the radioactive decay of U238 is 4.5 billion years and is independent of initial concentration] An equilibrium mixture contains 2 moles of sulphur dioxide, 1 mole of oxygen and 6 moles of sulphur trioxide.