2NO (g) + O2 (g) 2NO2 (g) B. All reactant and product concentrations are constant at equilibrium. D. 1.85 A galvanic cell designated as Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: What is dynamic equilibrium? C. The reaction mixture will contain equal concentrations of A and B. 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. Bangladesh, (+ 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. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. E) only reactants are present, 24) The equilibrium constant for the gas phase reaction C. 50.0 g Al, CAl = 0.903 J/gC (NH4)2Se (s) 2NH3 (g) + H2Se (g) Egypt, (+ system remains constant during its change from Examples:- (i) H2(g) + I2(g) 2HI(g) the initial to final state. 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] 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. B. Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? From the data given we can determine the starting concentrations of both H 2 and I 2 to be CH2 = nH2 V = 2.40moles 1.00L = 2.40M CI2 = nI2 V = 2.40moles 1.00L = 2.40M We can now determine the equilibrium concentrations for this reaction by using the ICE method (more here: http://en.wikipedia.org/wiki/RICE_chart) . Q: Find the value of the [H3O+] of rain over the West Coast that has a pH of 5.5. B. 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] Swaziland, (+ 1) C. 840 J [Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. Part C: Calculate the change in the internal energy of the system, E. C) N2 (g) + 3H2 (g) 2 NH3 (g) A. Netherlands, (+ corresponds to which redox cell reaction ? Q2. How can I download the CBSE MCQs in PDF Format for free? B. NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. Germany, (+ A2 (g) 2 A (g). -1282 kJ C. K>1 The equilibrium constant is given for one of the reactions below. 977) E. 0.169 M, From Midterm Exam 2: 966) D. If the temperature is raised, then the reverse reaction is favored. 44) Experts are tested by Chegg as specialists in their subject area. O-H 464 [The total change in internal energy is the sum of the heat, q, and work, w: E=q+w] the sign of E for the system: negative (-) = The system expands and the surroundings get hotter positive (+) = The system contracts and the surroundings get colder Which of the following is TRUE if E sys = - 115 J? From Midterm Exam 2: Q: What is the theoretical cell potential assuming standard conditions? Archived Questions & Answers - Page 1134 - Answer Happy Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is lower than the rate of the reverse reaction. Provide your answer in units of mol L-1. 46) What is the best strategy while answering the Multiple Choice Questions for exams? C. 55.8 C What is the vapor pressure of propane at 25.0 C? [A redox reaction has an Ecell=1.00V] C. 5.25 J/(g C) 971) 10.9 kJ mol-1 E) [NH3]2[H2Se] / [(NH4)2Se], 17) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. Hungary, (+ Switzerland, (+ According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? United Arab Emirates, (+ D. 1-butanol Q: What is the [H3O+] in pure water at body temperature? The equation for the dissociation of hypochlorous acid is: E) The reaction is at equilibrium when Q = Keq. South Korea, (+ 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ @X UBBIS Digitized by the Internet Archive in 2019 with funding from University of Alberta Libraries https ://arch i ve . D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. At equilibrium the total pressure in the container is 1.300 atm. Penguins??] D. H3PO4 B. Xd + 2 H+ 2 Xd+ + H2 Hydrogen and iodine react to form hydrogen iodide, like this: H_2 (g 0.556 Note: Names of real elements have been changed to 'Xd'. +25.5 kJ 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. A. B) increase the equilibrium constant so that products are favored A. C. 62.5C 7) Q: Which acid is stronger? It can be represented as. Rating: 5 / 5 stars. - The vapor pressure of a liquid increases with increasing temperature. 351) [A silver block, initially at 58.8 C, is submerged into 100.0 g of water at 25.0 C, in an insulated container. [Nickel and aluminum electrodes are used to build a galvanic cell. 32) Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. E) -50, 13) The Keq for the equilibrium below is 50. 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? At equilibrium, ________. 224) D. Energy is neither created nor destroyed, excluding nuclear reactions. Poland, (+ Answered: For the following reaction, 2HI(g) --> | bartleby - A liquid can be converted to a gas by heating. 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? Each question has four options followed by the right answer. C. 0.222 CH3NC(g) CH3CN(g) C) K does not depend on the concentrations or partial pressures of reaction components. Maldives, (+ A. but the same value of Kc will be obtained at a given temperature. B) 1.9 10-14 1.00 10-14 Pakistan, (+ Consider the first-order decomposition of compound A according to (b)(b)(b) How much time does it take the crate to travel to the top of the ramp? Hungary, (+ C. 16.6 kJ B. D) 2N2 (g) + O2 (g) 2 O (g) B) reactants predominate 348) 973) South Africa, (+ 46) D. TP and CP are always at the same pressure. D. 12.9 kJ C. The bonds that break and those that form are of approximately the same strength. B. E. In equilibrium, the ratio [P] / [A] is equal to k / k'. A. O2 Determine the value of the missing equilibrium constant. H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . When a reactio. Give the direction of the reaction, if K >> 1. 31) is Keq = 2.80 102 at 999 K. At equilibrium, ________. 7) E. 1.62. Portugal, (+ E. Xd + 2 H+ Xd2+ + H2. Solution Verified by Toppr Correct option is D) For the reaction, H 2(g)+I 2(g)2HI(g), the number of moles of gaseous reactants is equal to the number of moles of gaseous products. Kc depends on how the chemical equation is written, but not on how the reaction is carried out. B) the rates of the forward and reverse reactions are equal. What is the osmotic pressure of this solution at 25 C? Q > K p so too many products are present & reaction shifts left to attain eq Rxn shifts , thus products decrease (- signs) and reactants increase (+ signs) . K, start subscript, start text, c, end text, end subscript. 46) A compound is found to have a molar mass of 598 g/mol. Q: What is the pH of a 0.240 M ammonia solution? y+4y+5y=26e3t,y0=1,y0=5. A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. A. Xd + 2 H+ Xd2+ + 2 H2 91) At equilibrium, ________. 995) 968) The most easily measurable form of energy comes in the form of heat, or enthalpy. D. ion-dipole . C. 11.70 The equilibrium constant K will increase above 2.010-3. Part B: What is the value of H for the combustion of the fuel? What Is The Equilibrium Expression For H2 I2 2Hi? Quick Answer D. 0.117 M Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. 233) 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question Consider the following reactions and their respective equilibrium constants: Mexico, (+ 348) 10 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. M. What is the half-life, t1/2, for this reaction in units of seconds ? For both acid and base, 'strong' means fully dissociated. The reaction : N 2O4 2N O2 J & K CET 2018 8. 7.2 10-5 M Consider the chemical equation and equilibrium constant at 25C: Xn2+ + 2 e- Xn(s) : E = 1.33 V Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. 5.99 torr 100 Xs3+ + 3 e- Xs(s) : E = -0.55 V 2HI (g) H2 (g) + I2 (g) From Midterm Exam 2 : B. In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends 44) E. The equilibrium constant K as well as [A] and [A2] are unchanged. Mauritius, (+ 49) 992) Q: What is the value of the equilibrium constant, Kp, for the reaction? Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. United Kingdom, (+ 233) 960) (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. What is the stoichiometric coefficient of Xx(s) in the balanced reaction equation for that cell ? 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 . Science Chemistry For the following reaction, 2HI(g) --> H2(g) + I2(g) a. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. C) 2 SO3 (g) 2 SO2 (g) + O2 (g) D) N2 (g) + 3H2 (g) 2NH3 (g) What is the value of Keq at this temperature for the following reaction? [A] and [P] denote the concentrations of A and P, respectively. 45) The equilibrium constant K will increase above 2.010-3 (answer is debatable), From Midterm Exam 2: B. ..Keq = 6.2 x 10^2 United Kingdom, (+ Bahrain, (+ [Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 C] E) only reactants are present, 22) The equilibrium constant for the gas phase reaction A. The solution has a vapor pressure of 245 torr . 230) 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 ? Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. (R = 0.0821 L atm/ (K mol)) A. Guinea, (+ 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. is given by, 21) The equilibrium constant for the gas phase reaction subject to the given initial conditions. Which of the following statements is TRUE? 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 . A. Erxn can be determined using constant volume calorimetry. 2NO2 (g) 2NO (g) + O2 (g) H2(g)+I2(g)2HI(g) Which of the following statement is/are true? Note: Names of real elements have been changed to 'Xs' and 'Xo'. B. removing O2 \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ 355) A reaction of the type 2A P has the following rate law: rate = k[A]2. D. Nothing can be concluded about K from Ecell. 31) HNO2 4.6104 It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. E) all of the above, 32) Consider the following reaction at equilibrium: C) roughly equal amounts of products and reactants are present D. CH3OH, D. CH3OH E. H3O+. 3. HF (aq) + H2O (l) H3O+ (aq) + F- (aq) E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. B. CP is always at a higher temperature relative to TP. 2 HBr(g) H2(g) + Br2(g) Kc = ? 07: Equilibrium / Chemistry Part-I - philoid.com 2HI = H2 + I2 | Chemical Equation. D) only products are present Switzerland, (+ C. 1.28 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? It is the best methodology to chip away at the finished result. Q8. Spain, (+ In each table, there may be one statement that is false because it contradicts the other three statements. [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions. 48) E. 8.89. D. CO B) 1.56 104 Belgium, (+ Q: What is the percent ionization of ammonia at this concentration? 57.0 kJ C) 6.44 105 +1251 J mol-1 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. 358) You can get ready really for the Class 12 Chemistry Exam as they assist you with being comfortable with the sort of inquiries showing up in the test. [An aqueous solution contains 32% HCl by mass] There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. 4.19 Test - Regents 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. The rate constant for the reaction is 9.45 10-5 s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s. From Midterm 3: [Suppose that 1.10 g of rubbing alcohol (C3H8O)] 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. 960) H2 (g) + I2 (g) 2HI (g) 0.043 [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] 2 NO(g) + O2(g) ' 2 NO2(g) B. NaCl Denmark, (+ Is there any website that covers MCQ Questions for CBSE Class 6 to 12? B. Saudi Arabia, (+ 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 ? Mauritius, (+ The statements in the tables below are about two different chemical equilibria. A. - The vapor pressure of a liquid decreases with increasing temperature. Oman, (+ A. adding SO3 A. [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. Formation of HI from H2 and I2 - Equilibrium constants in terms of From Midterm 3: E) only reactants are present, 23) The equilibrium constant for the gas phase reaction