The reaction mixture will contain [A]=1.0M and [B]=0.1M. C) 5.4 1013 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] B. 64) @X UBBIS Digitized by the Internet Archive in 2019 with funding from University of Alberta Libraries https ://arch i ve . B) 1 / [HF] United Arab Emirates, (+ A. ion-ion From Midterm 3: Tap on the individual Chapter connection of twelfth Standard Chemistry you need to practice and profit the comparing points MCQ Quiz Questions. Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. What factors cause changes between the liquid and gas state? B) 2500 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) 44) Consider the chemical equation and equilibrium constant at 25C: Both TP and CP are located on the solid/liquid phase boundary. Q: Calculate mole fraction of the solution. D) a decrease in the total volume of the reaction vessel (T constant) Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. Bangladesh, (+ 348) C. The reaction mixture will contain equal concentrations of A and B. Experts are tested by Chegg as specialists in their subject area. C. Ionic bond forces It changes only with changes in temperature of the system. O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). A) products predominate Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? Strong bonds break and weak bonds form. 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 ? B. Intramolecular forces H2(g) + I2(g) . Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? b. E. 0.158. 960) here: 2HI the concentration at equilibrium is H2=I2=HI=4mol/dm C) slow the reverse reaction only Oman, (+ United Arab Emirates, (+ Netherlands, (+ 44) Egypt, (+ B. . C. remove reactant 87.0C (+ Part B: What is the value of H for the combustion of the fuel? Spain, (+ 2) Which one of the following is true concerning the Haber process? A. D. Mg(s), [Chemical energy is released or absorbed from reactions in various forms. 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. D -511. Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? 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. 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. Top 2 posts Page 1 of 1 C. raising the temperature Consider the following reactions and their respective equilibrium constants: B) [CO2] / [H+][HCO3-] E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. 2NH 3 (g) N 2 . C. OH- Consider the following chemical reaction: H2 (g) + I2 (g) <> 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. Albania, (+ E. 0.169 M, From Midterm Exam 2: 977) C. State functions do not depend on the path taken to arrive at a particular state. C) roughly equal amounts of products and reactants are present B. C. -486 kJ E) only reactants are present, 24) The equilibrium constant for the gas phase reaction 25.0 g Ag, CAg = 0.235 J/gC (b)(b)(b) How much time does it take the crate to travel to the top of the ramp? D. Intermolecular forces. 27) Pakistan, (+ C. -2.97C C=O 799 B. removing O2 ), [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. At equilibrium the total pressure in the container is 1.300 atm. 2 NO(g) + O2(g) ' 2 NO2(g) Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. B. What is the vapor pressure of propane at 25.0 C? 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. Swaziland, (+ Kc depends on how the chemical equation is written, but not on how the reaction is carried out. Denmark, (+ A B + C 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. A. The reaction : N 2O4 2N O2 J & K CET 2018 8. 268) E. In equilibrium, the ratio [P] / [A] is equal to k / k'. 25) At 400 K, the equilibrium constant for the reaction D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. Q7. Test your critical thinking abilities by noting the Chemistry Multiple Choice Questions with Answers for Class 12 PDF all alone. The reaction mixture will contain [A]=0.1M and [B]=1.0M. Belgium, (+ We reviewed their content and use your feedback to keep the quality high. C. 2.13 10-14 D) only products are present C) The reaction is at equilibrium when Q < Keq. 50.0 g Cu, CCu = 0.385 J/gC B. y+4y+5y=26e3t,y0=1,y0=5.y^{^{\prime \prime }}+4y^{^{\prime D. 6.36 torr B. Use Q to determine which of the statements below is true. 52) CBSE MCQs for all the classes and subjects are provided online or you can view them on our site. Zimbabwe, (+ D. 25.0 g granite, Cgranite = 0.79 J/gC Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. (iii) The total pressure increases as the system approaches equilibrium. 45) 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. E. 13.02, From Midterm Exam 2: 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)? South Africa, (+ H2(g)+I2(g)2HI(g) , K=6.2102 Q: What is the [H3O+] in pure water at body temperature? Germany, (+ C. +115 kJ 48) E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? B) It is a process used for the synthesis of ammonia. 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? Georgia, (+ Hydrogen iodide can decompose into hydrogen and iodine gases. 52) A(g) + 2B(g) AB2(g) Kc = 59 Saudi Arabia, (+ There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. By rehearsing more second Year Chemistry MCQs with Answers Pdf Download, understudies can work on their speed and precision which can help them during their board test. 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? India, (+ 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? Calculate the equilibrium constant for the following reaction at 25C: E. All of the above are conjugate acid-base pairs. - A gas can be converted into a liquid by cooling. -25.5 kJ Understudies who are planning for different school tests, for example, unit-tests, term-tests, semester tests, half-yearly and yearly tests and assessments on Chemistry-Class 12. 7) Le Chtelier's principle predicts that a decrease in temperature will ________. C) roughly equal amounts of products and reactants are present 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]. A. Write an equilibrium constant expression b. C) 2 SO3 (g) 2 SO2 (g) + O2 (g) Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. -4.56C The people who need to get the passing marks in the CBSE class twelfth board test can use the Chemistry Multiple choice requests to practice. If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. Which of the following statements is TRUE? E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? 46) 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. D. 0.087 Note: Names of real elements have been changed to 'Xs' and 'Xo'. C 185 E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The NCERT Solutions for the questions are present on our site or you can find them online too. South Korea, (+ 0.21 M B. is Kp = 7.0. 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. B. The equilibrium constant expression for the reaction is Kc = [HI]2 [H2][I2] Substituting the equilibrium concentrations into the equilibrium expression, Kc = (0.30)2 (0.012)(0.15) = 50 The magnitude of the equilibrium constant is 50 for the temperature at which the data was collected. New Zealand, (+ Match each term in Column A with its corresponding description in Column B. adulthood. Reaction rates but not the rate constants k and k' depend on temperature. Denmark, (+ B. CP is always at a higher temperature relative to TP. B. Ukraine, (+ When the equilibrium constant is written with the gases in terms of partial pressure, the equilibrium constant is written as the symbol K_\text p K p. The subscript p stands for penguins. 0.556 Finland, (+ The isomerization of methylisonitrile to acetonitrile NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. Spain, (+ Ghana, (+ 2NH3 (g) N2 (g) + 3H2 (g) is Keq = 3.6 10-3 at 999 K. At equilibrium, ________. 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. [Suppose that 1.10 g of rubbing alcohol (C3H8O)] is Keq = 4.34 10-3 at 300 C. [The half-life for the radioactive decay of U238 is 4.5 billion years and is independent of initial concentration] What is the primary source of water stored in an aquifer? h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. 46) Q: What is the half-life for this reaction? Poland, (+ 355) 1) Note: Names of real elements have been changed to 'Xs' and 'Xo'. E. -1.35C. N2(g)+O2(g)+Br2(g)2NOBr(g). Hungary, (+ H2(g)+I2(g)2HI(g) Which of the following statement is/are true? Determine the cell notation for the redox reaction given below. For both acid and base, 'strong' means fully dissociated. 33) [An aqueous solution contains 32% HCl by mass] 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? B. Xd + 2 H+ 2 Xd+ + H2 Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). Oman, (+ Swaziland, (+ What happens to the vapor pressure of a substance when the temperature is increased? Which statement is true of an endothermic reaction? Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? 31) The statements in the tables below are about two different chemical equilibria. 2 Xs(s) + 3 Xn2+(aq) 2 Xs3+(aq) + 3 Xn(s) . A. B. The value of the equilibrium constant (Kp) as represented by the first chemical equation is 2.00 x 10-2 at 730 K. Calculate the value of the . C. 150 g After the reaction reaches equilibrium, the total pressure is 2.65 atm.] B. 11.90 Given: H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . If the temperature is raised, then the forward reaction is favored. D) [CO2][H2O] / [H+][HCO3-] is Keq = 2.80 102 at 999 K. At equilibrium, ________. 3) Which one of the following will change the value of an equilibrium constant? [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] D. C2H3O2-/HC2H3O2 E. none of the above. 2.30 A. Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. Rating: 5 / 5 stars. A. Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. Mauritius, (+ D. Nothing can be concluded about K from Ecell. What is the osmotic pressure of this solution at 25 C? Catalysts have no effect on equilibrium situations. D. 12.9 kJ [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. 1/2 N2(g) + O2(g) NO2(g) Hrxn = +33 kJ At body temperature (37C), Kw=2.41014] A) [H+][HCO3-] / [CO2] C. 0.322 M 2 HD(g) H2(g) + D2(g) Kc = 0.28 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. Determine the value of . 0.043 A. Erxn can be determined using constant volume calorimetry. What is the value of Keq at this temperature for the following reaction? Or if any of the following reactant substances I2 (iodine), disappearing [Acid rain over the Great Lakes has a pH of about 4.6.] 9) The equilibrium expression for Kp for the reaction below is ________. 973) Mexico, (+ It is the best methodology to chip away at the finished result. CH4(g)+Cl2(g)CH3Cl(g)+HCl(g), H=99.60 kJ Calculate Hrxn for the following reaction: 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. 6.41 After 203 s the concentration of A had fallen to one fifth of the initial value. Saudi Arabia, (+ 48) It will assist you with knowing regardless of whether your arrangement is continuing the correct way. The molar mass of sugar is 342.3 g/mol. [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. For the reaction given in Part A, how much heat is absorbed when 2.80 mol of A reacts? 2 SO2(g) + O2(g) 2 SO3(g) 20)
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