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Or if any of the following reactant substances I2 (iodine), disappearing 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. In each table, there may be one statement that is false because it contradicts the other three statements. Calculate the standard enthalpy change for the reaction E. -91 kJ, Identify an element that is NOT in its standard state. 45) Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). Q: What is the pH of a 0.240 M ammonia solution? B) increase the partial pressure of CO2 (g) C. remove reactant Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. Which of the following statements is TRUE? A. Assume excess SiO2. 8) The equilibrium expression for Kp for the reaction below is ________. Determine the equilibrium concentration, [H3BO3], of this weak acid in the solution. 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. The formation of HI from H2 and I2 is an example of gaseous homogeneous equilibrium reaction. A. Covalent bond forces 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. D. capillary action 992) 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. Ghana, (+ E. H3O+. E) The reaction is at equilibrium when Q = Keq. Saudi Arabia, (+ D. all of the above Rating: 5 / 5 stars. HNO2 4.6104 A) [NH3][H2Se] / [(NH4)2Se] B) H2 (g) + Cl2 (g) 2 HCl (g) Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. 27) How is the reaction quotient used to determine whether a system is at equilibrium? Q: What is the half-life for this reaction? O-H 464 For a chemical equilibrium reaction H2 (g) + I2 (g) 2HI(g) write an expression for Kp (and relate it to Kc). Weak bonds break and strong bonds form. 49) 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. 358) 48.6 C 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)? [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] [Like all equilibrium constants, the value of Kw depends on temperature. E) The reaction is at equilibrium when Q = Keq. C. 50.0 g Al, CAl = 0.903 J/gC What state transition or transistions occur in carbon dioxide if you begin with a sample of carbon dioxide at 60.0 C at 50.0 atm and warm the sample to 10.0 C and 50.0 atm? 4.19 Here you will find NCERT MCQ Questions for Class 12 Chemistry with Answers PDF Free Download based on the important concepts and topics given in the textbook.This may assist you to understand and check your knowledge about the chapters. is Keq = 4.34 10-3 at 300 C. 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. D. The value of K remains, but the equilibrium is shifted towards more products. To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. 380) Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? C. 3.42 torr 960) For the reaction given in Part A, how much heat is absorbed when 2.80 mol of A reacts? Which metal ion in the list is most difficult to reduce? (look up carbon dioxide phase diagram), Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? 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. Nigeria, (+ Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] is Kp = 7.0. +1251 J mol-1 D) [NH3]2[H2Se] Q: What is the mass of the silver block? +25.5 kJ D. 5.11 E) decrease the partial pressure of CO, D) increase the value of the equilibrium constant, 34) Consider the following reaction at equilibrium. Provide your answer in units of coulombs (C). where n represents the stoichiometric coefficients] H2(g)+I2(g)2HI(g) , K=6.2102 C. N(g) 100 Turkey, (+ 87.0C Provide an explanation. 7) 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. 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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) A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. C. The value of K remains, but the equilibrium is shifted towards more reactants. 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. 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] D. +653 J mol-1 Nepal, (+ Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. C-O 360 Q: At what temperature does benzene boil when the external pressure is 460 torr ? B. HPO42- User Agreement,Privacy Policy [Consider these two acids and their Ka values: What is the primary source of water stored in an aquifer? H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 27) B) [(NH4)2Se] / [NH3]2[H2Se] 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. 52) The equilibrium constant K p is independent of (A) Total pressure (B) Catalyst (C) The amounts of H 2 and I 2 present However, it changes with Temperature (a) total pressure(b) catalyst used(c) amount of H2 and I2(d) temperature, (a) 2 10-4(b) 4 10-2(c) 2 10-2(d) 1 10-2, (a) bar min-1, bar2 min-1(b) bar min-1, bar1/2 min-1(c) bar1/2 min-1, bar2 min-1(d) bar min-1, bar1/2 min-1, (a) 9 times(b) 4 times(c) 16 times(d) 8 times, (a) NH4NO2 N2 + 2H2O(b) NO + O3 NO2 + O2(c) 2NO + Br2 2NOBr(d) CH3CHO CH4 + CO, (a) mol L-1 s-1(b) s-1(c) mol-2 L s-1(d)mol L-1, (a) (i)2, (ii) 1(b) (i)2,(ii) 2(c) (i) 1, (ii) 1(d) (i) 1, (ii) 2, (a) temperature of the reaction(b) extent of the reaction(c) initial concentration of the reactants(d) the time of completion of reaction, (a) Rate = k [O] [O3](b) Rate = k [O3] [O2]-1(c) Rate = k [O3](d) Rate = k [O2] [O], (a) zero order reaction(b) first order reaction(c) second order reaction(d) third order reaction, (a) order of a reaction(b) molecuiarity of a reaction(c) fast step of the mechanism of a reaction(d) half-life of the reaction, (a) the order and molecuiarity of the slowest step are equal to one(b) molecuiarity of the reaction can be zero, one or two(c) molecuiarity of the reaction can be determined only experimentally(d) more than one reacting species are involved in one step, (a) the order and molecuiarity of the slowest step are equal to one, (a) the rate of fastest intermediatestep(b) the sum total of the rates of all intermediate steps(c) the average of the rates of all the intermediate steps(d) the rate of slowest intermediate step, (d) the rate of slowest intermediate step, (a) temperature(b) mechanism of reaction as well as relative concentration of reactants(c) molecularity(d) pressure, (b) mechanism of reaction as well as relative concentration of reactants, (a) inversely proportional to the concentration units(b) independent of concentration units(c) directly proportional to concentration units(d) inversely proportional to the square of concentration units, (a) 2 10-2 s-1(b) 4 10-4 s-1(c) 20 s-1(d) 2 10-4 s-1, (a) EaR(b) Ea2.303R(c) 2.303Ea.R(d) Ea2.303, (a) mol L-1s-1(b) s-1(c) L mol-1s-1(d) L2mol-2s-1, (a) triple(b) increase by a factor of 4(c) double(d) remain unchanged. Q: Which acid is stronger? 44) 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. Determine the value of . 992) 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} 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. C. 1.94 A) Q does not change with temperature. B. From Midterm Exam 2: 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. D. 32.2 kJ mol-1 B.54.4 J 49) C. 11.70 B -423 [The reaction X products is second order in X and has a rate constant of 0.035 M1s1] E. -1.35C. C. dipole-dipole D) 2HI (g) H2 (g) + I2 (g) 973) 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. A. Mexico, (+ 348) A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. E. 9.40, A mixture containing 20.6 g of ice (at exactly 0.00 C) and 70.3 g of water (at 62.9 C) is placed in an insulated container. According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? B) 0.50 D. 12.9 kJ A. NH4+/NH3 E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? Maldives, (+ E) 4 Fe (s) + 3 O2 (g) 2 Fe2O3 (s), 29) Which reaction will shift to the right in response to a decrease in volume? A. K<1 Decreased? 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. 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? H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? C. The reciprocal concentration, [A]-1, changes linearly with time. 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. B. Asked by sumandeesinghrana | 12 Oct, 2010, 03:00: PM Expert Answer Dear Student For the reaction H 2 + I 2 --------> 2HI Ukraine, (+ Albania, (+ Determine the value of the missing equilibrium constant. A. F2 Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. 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. For a process at constant pressure, 49,600 calories of heat are released. A. B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. 2A(g) + 2B(g) A2B2(g) Kc = 28.2. A. B. Intramolecular forces E) Q is the same as Keq when a reaction is at equilibrium. 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\ The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). B. These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. C) 5.4 1013 C. H3O+/OH- B. - A gas can be converted into a liquid by decreasing the pressure of a gas sample. D. Energy is neither created nor destroyed, excluding nuclear reactions. H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) c. Which metal in the list is most reactive? Maldives, (+ Exams . C. OH- A. ion-ion In a particular experiment, the partial pressures of H 2 and I 2 From Midterm 3: A) N2 (g) + 3H2 (g) 2NH3 (g) 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. Since there is not a viable alternative for it. 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. B) reactants predominate Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. 268) B) 1.56 104 224) C. 12.28 See some more details on the topic What is the equilibrium expression for H2 I2 2HI? For both acid and base, 'strong' means fully dissociated. A. Xd + 2 H+ Xd2+ + 2 H2 351) 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. 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 . The equation for the dissociation of hypochlorous acid is: Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question B. K=0 ..Keq = 6.2 x 10^2 Each question has four options followed by the right answer. From Midterm 3: The gases react to form l-l] according to the equation above. - A liquid can be converted to a gas by heating. Write an equilibrium constant expression b. United Kingdom, (+ 32) is given by, 21) The equilibrium constant for the gas phase reaction Which one statement regarding the first-order reaction 0.21 M B. [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] C. 16.6 kJ B. D. 1.85 Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston.