C. 3.42 torr D. +473 kJ A. 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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: 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. 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. Zimbabwe. 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question A. E) -50, 13) The Keq for the equilibrium below is 50. Mauritius, (+ is Keq = 230 at 300 C. Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. 93) B. Intramolecular forces The equilibrium constant K will increase above 2.010-3 (answer is debatable), From Midterm Exam 2: [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] D. CO 33) 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: From Midterm Exam 2: (Methanol ( CH3OH ) contains hydrogen directly bonded to oxygen, so it has hydrogen bonding. 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. B. Afghanistan, (+ Turkey, (+ Asked by sumandeesinghrana | 12 Oct, 2010, 03:00: PM Expert Answer Dear Student For the reaction H 2 + I 2 --------> 2HI 20) The reaction mixture will contain [A]=1.0M and [B]=0.1M. 45) 2NO2 (g) 2NO (g) + O2 (g) 49) Swaziland, (+ [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] The statements in the tables below are about two different chemical equilibria. Turkey, (+ 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. B) a decrease in the total pressure (T constant) A. 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)? 2 Xs(s) + 3 Xn2+(aq) 2 Xs3+(aq) + 3 Xn(s) . [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. The molar mass of sugar is 342.3 g/mol. Initially, the vessel contains only X2 at a pressure of 1.75 atm. 2.35 x 104 kJ/mole E. In equilibrium, the ratio [P] / [A] is equal to k / k'. D. 1-butanol 31) It will assist you with knowing regardless of whether your arrangement is continuing the correct way. Q: Find the value of the [H3O+] of rain over the West Coast that has a pH of 5.5. 971) 1/2 N2(g) + O2(g) NO2(g) Hrxn = +33 kJ 91) 49) y+4y+5y=26e3t,y0=1,y0=5. D. 32.2 kJ mol-1 Le Chtelier's principle predicts that a decrease in temperature will ________. At body temperature (37C), Kw=2.41014] Q6. If the equilibrium constants for the formation of H S from H 2S is 1.0 107 and that of S 2 from H S ions is 1.2 1013 then the concentration of S 2 ions in aqueous solution is - JEE Main 2018 9. E. 1.62. - A liquid can be converted to a gas by heating. 355) If you find. (NH4)2Se (s) 2NH3 (g) + H2Se (g) Guinea, (+ 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) B. B. Ghana, (+ - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. E. increase pressure, The following reaction is exothermic. Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. 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. NO(g)+12Br2(g)NOBr(g)Kp=5.3 B. K=0 C. Xd2+ + 2 H+ Xd + H2 After the reaction reaches equilibrium, the total pressure is 2.65 atm.] 41) 2 NO (g) N2 (g) + O2 (g). C) N2 (g) + 2O2 (g) 2NO2 (g) D) [H3O+][F-] / [HF] is first order in CH3NC. Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. 880) India, (+ Bangladesh, (+ Germany, (+ 3. 2NO(g)N2(g)+O2(g)Kp=2.11030 Q: What is the pH of a 0.240 M ammonia solution? C) 2 SO3 (g) 2 SO2 (g) + O2 (g) Provide your answer in units of mol L-1. United Kingdom, (+ The law of ________ states that energy that can be neither created or destroyed. 0.13 M C. 4.3 M D. 0.039 M A. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. A. Ukraine, (+ - The vapor pressure of a liquid decreases with increasing temperature. [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 Assume excess SiO2. +25.5 kJ 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. 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 Strong bonds break and weak bonds form. 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. The solution has a vapor pressure of 245 torr . a. C. 150 g Nigeria, (+ 0.183 H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? -69.8 J mol-1 A. adding SO3 \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ Belgium, (+ 2.65 HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). 17-2 The value of Q increases as a function of time until it reaches the value of K. b) No, Q would still increase with time because the [I2] would decrease in exactly the same way as [H2] decreases. B. Hrxn can be determined using constant pressure calorimetry. 9) The equilibrium expression for Kp for the reaction below is ________. 995) A reversible reaction can proceed in both the forward and backward directions. Spain, (+ A. H2(g) Weak bonds break and strong bonds form. E) [NH3]2[H2Se] / [(NH4)2Se], 17) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? You can likewise reconsider all Chemistry sections appropriately and save time during your group tests and tests. B) increase the partial pressure of CO2 (g) [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] B. removing O2 South Korea, (+ 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} The equilibrium constant K will increase above 2.010-3. 0.269 For the reaction : 2HI(g) H2 (g)+ I2 (g), the degree of dissociated () of HI(g) is related to equilibrium constant Kp by the expression: For the reaction H2(g) + I2(g) 2HI(g) the equilibrium constant kp changes with. [An aqueous solution contains 32% HCl by mass] \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ -1282 kJ C. remove reactant B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. -2.16C A. 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? A. BF3 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. Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. B. A. C. HF 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. From Midterm Exam 2: 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). 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. 45) A. F2 A. (iii) The total pressure increases as the system approaches equilibrium. Mexico, (+ . C. -2.97C Sweden, (+ PART B: C) roughly equal amounts of products and reactants are present Russia, (+ C. 50.0 g Al, CAl = 0.903 J/gC 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. D. TP and CP are always at the same pressure. 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. Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. Understudies who are concentrating in CBSE, ICSE, IGCSE schools as well as different State Board schools. C. 22.1 kJ mol-1 What happens to the vapor pressure of a substance when the temperature is increased? is Keq = 2.80 102 at 999 K. At equilibrium, ________. 268) Provide your answer in units of volts (V). E. Xd + 2 H+ Xd2+ + H2. From Midterm 3: D. increase reactant 380) 41) For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . [A silver block, initially at 58.8 C, is submerged into 100.0 g of water at 25.0 C, in an insulated container. 32) Part A: What is the value of E for the combustion of the fuel? 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. Determine the cell notation for the redox reaction given below. B. hydrogen bonding Br2 (g) + Cl2 (g) 2BrCl (g) In this case, you just need to observe to see if product substance HI (hydroiodic acid), appearing at the end of the reaction. So Kp = (PH2) x (PI2) / PHI^2 P = partial pressure 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] Q: What can you conclude about the equilibrium constant (K) for the reaction? 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. C. Neither direction is favored. At equilibrium the total pressure in the container is 1.300 atm. Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. The NCERT Solutions for the questions are present on our site or you can find them online too. H2 (g) + I2 (g) HI (g) What is the value of Keq for the following reaction? Both TP and CP are located on the solid/liquid phase boundary. -25.5 kJ From Midterm Exam 2: 41) E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The isomerization of methylisonitrile to acetonitrile 263) Bahrain, (+ 8.36 torr Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as gaining heat from the surroundings? E. The value of pH is 2.13. 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. 2HI = H2 + I2 | Chemical Equation. In each table, there may be one statement that is false because it contradicts the other three statements. D) Q does not depend on the concentrations or partial pressures of reaction components. B. Xd + 2 H+ 2 Xd+ + H2 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. C. raising the temperature 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. D. 4.60. B. 224) The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . 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. United Arab Emirates, (+ 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 . M. What is the half-life, t1/2, for this reaction in units of seconds ? Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. A. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: C. 16.6 kJ These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. C) decrease the value of the equilibrium constant B) the rates of the forward and reverse reactions are equal. A. 960) C. K>1 380) 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. Portugal, (+ 7) A 250 mL sealed flask contains 0.65 g of butane at 22C.] Additionally, you can reconsider all Chemistry sections appropriately whenever and save significant season of yours during class tests and yearly tests readiness. 0.233 M E) Q is the same as Keq when a reaction is at equilibrium. What is the Kw of pure water at 50.0C, if the pH is 6.630? Q: What is the mole fraction of hexane? H2(g) + I2(g) 2HI(g) At equilibrium, the mixture is found to contain 1.580 mole of HI. B. For the reaction H2(g) + I2(g) 2HI (g), the standard free energy is G^ > 0. A. viscosity C. 0.222 C. 11.70 995) and Poland, (+ Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. (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. 2COF2(g)CO2(g)+CF4(g), Kc=6.30 The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) 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. 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. 44) is given by, 21) The equilibrium constant for the gas phase reaction 26) Which of the following statements is true? Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees.