5.99 torr Georgia, (+ Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. 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. To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. 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. Q: What is the mass of the silver block? D. 5.50 10-14 E. 0.169 M, From Midterm Exam 2: 960) 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) 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. 26) Which of the following statements is true? Note: Names of real elements have been changed to 'Xd'. He(g) Calculate Hrxn for the following reaction: E. There is not enough information to calculate the Kw. Turkey, (+ [The reaction X products is second order in X and has a rate constant of 0.035 M1s1] A) 25 -1282 kJ Q: If a reaction mixture is initially 0.20 M in X, what is the concentration of X after 151 seconds? C-H 414 C. 16.6 kJ HNO2 4.6104 Germany, (+ B) N2O4 (g) 2NO2 (g) A. a. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. A reversible reaction can proceed in both the forward and backward directions. What is the rate constant, k, for this reaction in units of L mol-1 s-1. H2 (g) + I2 (g) 2HI (g) D) Q does not depend on the concentrations or partial pressures of reaction components. C. 12.54 Guinea, (+ [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] At body temperature (37C), Kw=2.41014] 355) 8.36 torr Netherlands, (+ 2 HBr(g) H2(g) + Br2(g) Kc = ? 33) B. D. 12.79 In each table, there may be one statement that is false because it contradicts the other three statements. E) Q is the same as Keq when a reaction is at equilibrium. 0.183 C. The value of pH is 6.65. Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. 6) The equilibrium-constant expression depends on the ________ of the reaction. A) 5.26 10-20 C) N2 (g) + 3H2 (g) 2 NH3 (g) E) decrease the partial pressure of CO, D) increase the value of the equilibrium constant, 34) Consider the following reaction at equilibrium. New Zealand, (+ Tajikistan, (+ After the reaction reaches equilibrium, the total pressure is 2.65 atm.] Portugal, (+ Answer Part B: Calculate the boiling point of the solution above. Cambodia, (+ There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. 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. B. The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . If the temperature is raised, then the forward reaction is favored. 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. C. 1.92 x 103 kJ/mole United Kingdom, (+ Which of the following is NOT a conjugate acid-base pair? N2(g)+O2(g)+Br2(g)2NOBr(g). Part A: What is the value of E for the combustion of the fuel? A -253 C) slow the reverse reaction only 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? 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: Exams . 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. C. The reciprocal concentration, [A]-1, changes linearly with time. For the equilibrium of the dissociation reaction of the compound 'A2', the concentrations were found to be [A2] = 0.022 M and [A] = 0.13 M at 25C: 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. A) The reaction quotient must be satisfied for equilibrium to be achieved. 1) 93) D) 2N2 (g) + O2 (g) 2 O (g) Essentt - Handpicked Products. When a reactio. 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. }}+5y=26e^{3t},~~~~~y_{0}=1,~y_{0}^{^{\prime }}=5. 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)? Finland, (+ 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. 4.19 HI(g)12H2(g)+12I2(g), The equilibrium constant is given for one of the reactions below. A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. B) At equilibrium, the reaction quotient is undefined. E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\ Energy can be transferred in many ways, one of which is in the form of work. 12.30 [Consider these two acids and their Ka values: Hrxn= npHf(products) nrHf(reactants) 10 8) The equilibrium expression for Kp for the reaction below is ________. 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. b. D) N2 (g) + 3H2 (g) 2NH3 (g) B. Xd + 2 H+ 2 Xd+ + H2 973) 87.0C The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. C) roughly equal amounts of products and reactants are present \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ 358) 37.5 g C. Ionic bond forces B. Where to download CBSE MCQs for all Classes and Subjects? with forward (A P) rate constant k and reverse (A P) rate constant k' is correct? 41) Zimbabwe, (+ (iii) The total pressure increases as the system approaches equilibrium. 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] 32) Hrxn = ? Zimbabwe. Note: Names of real elements have been changed to 'Xx' and 'Xa'. The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). Science Chemistry For the following reaction, 2HI(g) --> H2(g) + I2(g) a. B) 1.9 10-14 Q: Find the volume of methane measured at 298 K and 1.72 atm required to convert 0.620 L of water at 298 K to water vapor at 373 K. The enthalpy change for converting 1.00 mol of ice at -50.0C to water at 70.0C is __________ kJ. A. F2 Finland, (+ At 100 C and 1 atm, water is in which phase? E) [NH3]2[H2Se] / [(NH4)2Se], 17) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? The most easily measurable form of energy comes in the form of heat, or enthalpy. The equilibrium constant (K ) would be __________. 977) Which statement applies to the equilibrium of this reaction after the pressure is changed to 2 bar, but with the temperature remaining at 30C ? Maldives, (+ 9.64 - The vapor pressure of a liquid increases with increasing temperature. Hungary, (+ 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. C. N(g) [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. 2A(g) + 2B(g) A2B2(g) Kc = 28.2. H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. 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 Let's flip the above reaction. CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. E) only reactants are present, 23) The equilibrium constant for the gas phase reaction 2 NO(g) + O2(g) ' 2 NO2(g) B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. United States, (+ H2 (g) + Br2 (g) 2 HBr (g) NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. Saudi Arabia, (+ 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. Which of the following substances would you predict to have the highest Hvap? B. HPO42- - A gas can be converted into a liquid by decreasing the pressure of a gas sample. C. Xd2+ + 2 H+ Xd + H2 2NO(g)N2(g)+O2(g)Kp=2.11030 E) only reactants are present, 24) The equilibrium constant for the gas phase reaction Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. A) products predominate Switzerland, (+ In a particular experiment, the partial pressures of H 2 and I 2 h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. Bangladesh, (+ Netherlands, (+ HC2H3O2 1.8105] 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. D. The value of pH is somewhat lower than 2.13. Egypt, (+ Hungary, (+ C) 7.07 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. B) [CO2] / [H+][HCO3-] - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Note: Names of real elements have been changed to 'Xs' and 'Xo'. C. 1-pentanol A. ion-ion Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). 64) Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. D) [SO3]2 / [SO2]2[O2]2 C. -2.97C 2.35 x 104 kJ/mole +238 kJ Cambodia, (+ India, (+ M. What is the half-life, t1/2, for this reaction in units of seconds ? 2SO2 (g) + O2 (g) 2SO3 (g) From Midterm 3: E. -117 kJ. What is the osmotic pressure of a solution made by dissolving 45.0 g of glucose, C6H12O6, in enough water to form 225.0 mL of solution at 36.0 C ? [Acid rain over the Great Lakes has a pH of about 4.6.] What is the vapor pressure of propane at 20.0 C? C. 3.42 torr 52) 20) The total number of stars for this article is: 5 in 1 review. 92) 230) A) [SO3] / [SO2][O2] A. 1) The solution has a vapor pressure of 245 torr . and 880) Substance Hf (kJ/mol) A 250 mL sealed flask contains 0.65 g of butane at 22C.] H2 (g) + I2 (g) HI (g) 49) Afghanistan, (+ B) reactants predominate 30.5 C CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) What is the vapor pressure of propane at 25.0 C? Bahrain, (+ H2(g)+I2(g)2HI(g) , K=6.2102 A. A. C. State functions do not depend on the path taken to arrive at a particular state. Sweden, (+ B. - A liquid can be converted to a gas by heating. Q8. The NCERT Solutions for the questions are present on our site or you can find them online too. From Midterm Exam 2 : According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? Q: What is the value of the equilibrium constant, Kp, for the reaction? Turkey, (+ 2003-2023 Chegg Inc. All rights reserved. B) H2 (g) + Cl2 (g) 2 HCl (g) E) none of the above, 12) The Keq for the equilibrium below is 50. E) -50, 13) The Keq for the equilibrium below is 50. What happens to the vapor pressure of a substance when the temperature is increased? - A gas can be converted into a liquid by increasing the pressure of a gas sample. A compound is found to have a molar mass of 598 g/mol. 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. Poland, (+ Mexico, (+ The gases react to form l-l] according to the equation above. Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: Here's an example. 28) Which reaction will shift to the left in response to a decrease in volume? 41) 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. Kc depends on how the chemical equation is written, but not on how the reaction is carried out. D. 4.60. 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. 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. -333 kJ (R = 0.0821 L atm/ (K mol)) A. Finland, (+ [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. E) The reaction will go to completion since there are equal amounts of Br2 and Cl2. Oman, (+ Spain, (+ 977) D. 13.16 You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 64) (Hint: Start with calculating the pH as if this were a monoprotic acid.) D. increase reactant D) The reaction is at equilibrium when Q > Keq. 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 forward reaction is favored. This problem has been solved! 9) The equilibrium expression for Kp for the reaction below is ________. 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. 1.14 J/(g C) A. 107 g E) only reactants are present, 22) The equilibrium constant for the gas phase reaction At equilibrium, ________. \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ Terms T&C. H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? D. TP and CP are always at the same pressure. 973) From Midterm 3: 3.48 J/(g C) B. C. 0.00048 D. 1.85 Le Chtelier's principle predicts that the moles of in the reaction container will increase with ________. 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. Nigeria, (+ 2075 2.30 Enter the email address you signed up with and we'll email you a reset link. C. 12.28 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 ? A2 (g) 2 A (g). 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: Bahrain, (+ Sweden, (+ Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. (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. 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. [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] 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. H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . Understudies who are getting ready for designing and clinical selection tests like NEET, IIT JEE, AIIMS, JIPMER and SAT Exams in Chemistry. E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. B. SiH4 966) In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. B. CP is always at a higher temperature relative to TP. C) at low temperature and low pressure A. 224) [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] 10.9 kJ mol-1 A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. Calculate Erxn for the combustion of sucrose in kJ/mol sucrose.