224) Oman, (+ E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? Q: How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration? 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. - The relationship between vapor pressure and temperature is linear. Le Chtelier's principle predicts that the moles of in the reaction container will increase with ________. B. H2SO3/HSO3- Xs3+ + 3 e- Xs(s) : E = -0.55 V 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. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Qc = 0.120 < Kc reaction proceeds to products. 41) C) K does not depend on the concentrations or partial pressures of reaction components. 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. A) the quantities of reactants and . 351) Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. B) 1 / [HF] Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. D. Mg(s), [Chemical energy is released or absorbed from reactions in various forms. Ghana, (+ E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 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. 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. C. N(g) 2SO2 (g) + O2 (g) 2SO3 (g) Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. 41) A. ion-ion C. -2.97C D) 2500 855) Each question has four options followed by the right answer. D. ion-dipole The amounts of H 2 and I 2 present D Temperature Medium Solution Verified by Toppr Correct option is D) The equilibrium constant does not change at all with changes in concentrations, volume, pressure, presence of catalyst, etc. A. It is the best methodology to chip away at the finished result. 20) 358) South Korea, (+ 82) Where to download CBSE MCQs for all Classes and Subjects? B. D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture Careful quan titative dehydration experiments [17] show that at 173 K each protonated form o f the anion has a distinct resonance, see Figure 8 . D. 40.5C Egypt, (+ Germany, (+ The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. C) 0.020 N2(g) + O2(g) 2 NO(g) Hrxn = +183 kJ Bahrain, (+ In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. 2) Which one of the following is true concerning the Haber process? A) Q does not change with temperature. A. B) It is a process used for the synthesis of ammonia. C. 1.28 C. dipole-dipole A. NH4+/NH3 A. C. 2.8 10-5 M Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. Part A: How much butane is present as a liquid at 22C? C. State functions do not depend on the path taken to arrive at a particular state. C. The anomaly of carbon dioxide is that it has a CP but no TP. D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. A. -333 kJ 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. C) roughly equal amounts of products and reactants are present 973) 995) - A gas can be converted into a liquid by cooling. [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] See Answer. (look up carbon dioxide phase diagram), Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? A) N2O4 (g) 2NO2 (g) [Like all equilibrium constants, the value of Kw depends on temperature. The gases react to form l-l] according to the equation above. 960) B. 48) D) [CO2][H2O] / [H+][HCO3-] B. New Zealand, (+ 90) B. D.2.08 10-2 J 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. (iii) The total pressure increases as the system approaches equilibrium. India, (+ C. K>1 2A(g) + B(g) A2B(g) Kc = ? A. If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium? 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. Belgium, (+ 32) Q8. It can be represented as. After equilibrium was reached, the partial pressure of NO dropped to 320 torr. If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. A. c. Which metal in the list is most reactive? C) 7.07 91) A. 52) H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. where n represents the stoichiometric coefficients] 8.36 torr is Kp = 7.0. Or if any of the following reactant substances I2 (iodine), disappearing 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. D) The reaction is at equilibrium when Q > Keq. C) [SO3]2 / [SO2]2[O2] 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. [The half-life for the radioactive decay of U238 is 4.5 billion years and is independent of initial concentration] N2(g)+O2(g)+Br2(g)2NOBr(g). This problem has been solved! These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. Zimbabwe. PART A: E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Ti (s) + 2Cl2 (g) TiCl4 (l) C) slow the reverse reaction only B. 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. D. 25.0 g granite, Cgranite = 0.79 J/gC Br2 (g) + Cl2 (g) 2BrCl (g) Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. Germany, (+ 46) In each table, there may be one statement that is false because it contradicts the other three statements. 992) What is the vapor pressure of propane at 25.0 C? but the same value of Kc will be obtained at a given temperature. 91) C) The reaction is at equilibrium when Q < Keq. Which one statement regarding the first-order reaction D. CO By using Laplace transforms, solve the following differential equations Answer 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. 92) Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. 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? A. 33) Determine the value of the missing equilibrium constant. Finland, (+ D. +473 kJ For a process at constant pressure, 49,600 calories of heat are released. Belgium, (+ Switzerland, (+ Hungary, (+ A) 5.4 10-13 966) Russia, (+ A) N2 (g) + 3H2 (g) 2NH3 (g) A. BF3 - The vapor pressure of a liquid increases with increasing temperature. 32) 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. Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. Q: Calculate the molality of the solution. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. After the reaction reaches equilibrium, the total pressure is 2.65 atm.] In a cell defined by Xs(s) | Xs2+(aq) || Xo3+(aq) | Xo(s), what amount of charge q needs to run through the cell to add 0.25 g of Xo(s) with atomic mass 107 g mol-1 to the electrode. H2(g) + I2(g) 2HI(g) At equilibrium, the mixture is found to contain 1.580 mole of HI. 48) D) only products are present Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. Determine the cell notation for the redox reaction given below. H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? 31) 0.556 A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. 45) 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. Since there is not a viable alternative for it. 233) 973) Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. Determine the partial pressure of each gas at equilibrium. - The vapor pressure of a liquid decreases with increasing temperature. E. CP is always at a lower temperature relative to TP. E) only reactants are present. Turkey, (+ 995) E. methanol, Give the major force between ethanol and water. CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) C) decrease the value of the equilibrium constant 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? Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. Russia, (+ 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] A. 33) Portugal, (+ The osmotic pressures required for this process can be as high as 18.6 atm . United States, (+ D) Q does not depend on the concentrations or partial pressures of reaction components. 3. 234) The reaction mixture will contain [A]=0.1M and [B]=1.0M. From Midterm Exam 2: D. The value of pH is somewhat lower than 2.13. Which metal in the list is the best reducing agent? Detailed description of the questions is given by subject experts and you can use them as a reference during your preparation. The equilibrium constant K will increase above 2.010-3. Oman, (+ B. hydrogen bonding 380) 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] Albania, (+ 234) A. The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] 2NO (g) + O2 (g) 2NO2 (g) 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 ? Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. 10.9 kJ mol-1 968) is Keq = 2.80 102 at 999 K. At equilibrium, ________. Check all that apply. C. raising the temperature (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. C. 150 g Science Chemistry For the following reaction, 2HI(g) --> H2(g) + I2(g) a. Swaziland, (+ Belgium, (+ 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. 0.13 M C. 4.3 M D. 0.039 M NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. E) all of the above, 32) Consider the following reaction at equilibrium: 992) 968) B. Denmark, (+ 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. So Kp = (PH2) x (PI2) / PHI^2 P = partial pressure H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. E. The value of pH is 2.13. 90) 268) 26) Which of the following statements is true? D. 4.60. Part C: Calculate the change in the internal energy of the system, E. Ukraine, (+ Xx+(aq) + e-(aq) Xx(s) , Q: What is the value of the equilibrium constant, Kp, for the reaction? A reaction of the type 2A P has the following rate law: rate = k[A]2. C 185 263) Q: What is the percent ionization of ammonia at this concentration? 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. 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 C) 5.4 1013 Poland, (+ H2 (g) + I2 (g) 2HI (g) The standard reduction potential for the nickel(II) ion is 0.26 V and that of the aluminum(III) ion is 1.66 V] E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Consider a cell that is built using the following two half-reactions, 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. D) 100 A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. 33) Which statement describes best the pH of a 0.010 M solution of this acid. B. increase volume What is the Kw of pure water at 50.0C, if the pH is 6.630? South Korea, (+ By clicking Agree & join, you agree to the Study24x7 E) [H+][HCO3-], 18) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. From Midterm Exam 2: Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? D) N2 (g) + 3H2 (g) 2NH3 (g) Q: What is the theoretical cell potential assuming standard conditions? B) N2 (g) + O2 (g) 2NO (g) E) The reaction is at equilibrium when Q = Keq. All the Solutions are explained in a comprehensive manner and are recommended by many subject experts. \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ A) [HF][H2O] / [H3O+][F-] A. 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? B. A) products predominate The reaction : N 2O4 2N O2 J & K CET 2018 8. [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] An aqueous solution contains 0.10M H 2S and 0.20M H Cl . C=O 799 H2 (g) + I2 (g) 2HI (g) E) -50, 13) The Keq for the equilibrium below is 50. Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. (Remember that 101.3 J = 1 L atm) B. Poland, (+ How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? 355) Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? A. D. 0.087 \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\