25) At 400 K, the equilibrium constant for the reaction D) The reaction is at equilibrium when Q > Keq. 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. H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . Rating: 5 / 5 stars. B. - A gas can be converted into a liquid by cooling. 0.269 Additionally, the Online Multiple decision questions will give you certainty to show up in the board test and take care of the complicated issues quicker. Pakistan, (+ In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. . Key points. 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. B. [An aqueous solution contains 32% HCl by mass] A. The Kc constant shows that the ratio of products to reactants is very small, indicating that a much higher concentration of reactants exists compared to the concentration of products. A. Detailed description of the questions is given by subject experts and you can use them as a reference during your preparation. E) Q is the same as Keq when a reaction is at equilibrium. A. The equilibrium-constant expression depends on the _____ of the reaction. is Keq = 2.80 102 at 999 K. At equilibrium, ________. Cambodia, (+ E) The reaction is at equilibrium when Q = Keq. C. 150 g Nepal, (+ From Midterm 3: Turkey, (+ You'll get a detailed solution from a subject matter expert that helps you learn core concepts. An equilibrium mixture contains 2 moles of sulphur dioxide, 1 mole of oxygen and 6 moles of sulphur trioxide. The total volume will change to half of the initial value at 1 bar. B. Denmark, (+ C. The value of pH is 6.65. B. 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. 0.556 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. viscosity C. 1.94 25.0 g Ag, CAg = 0.235 J/gC Consider the chemical equation and equilibrium constant at 25C: 64) Hydrogen iodide can decompose into hydrogen and iodine gases. 34) If you have any queries regarding The Solid State CBSE Class 12 Chemistry MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon. For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the What is the mole fraction xA of liquid A in this mixture. South Korea, (+ D. 0.087 977) C. -16.0 kJ B. increase volume Consider the chemical equation and equilibrium constant at 25C: Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. Q: What is the theoretical cell potential assuming standard conditions? B) H2 (g) + Cl2 (g) 2 HCl (g) Germany, (+ [A] and [P] denote the concentrations of A and P, respectively. E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? 41) 27) How is the reaction quotient used to determine whether a system is at equilibrium? Thank you for your participation! B. 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N2 E. -91 kJ, Identify an element that is NOT in its standard state. 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. Q3. 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: Which metal ion in the list is most difficult to reduce? A) The reaction quotient must be satisfied for equilibrium to be achieved. d. Which metal ion in the list is the easiest to reduce? A) N2 (g) + 3H2 (g) 2NH3 (g) 2NO(g)N2(g)+O2(g)Kp=2.11030 Using the equilibrium constant calculated in 2, calculate . What is the osmotic pressure of a solution made by dissolving 45.0 g of glucose, C6H12O6, in enough water to form 225.0 mL of solution at 36.0 C ? HC2H3O2 1.8105] Bangladesh, (+ -25.5 kJ C. Ionic bond forces 45) Egypt, (+ Terms T&C. Germany, (+ C) 0.020 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. 49) Understudies who are planning for serious assessments like NTSE, Olympiad, and so forth for class 12. D. 12.79 A -253 CH3NC(g) CH3CN(g) 992) For a process at constant pressure, 49,600 calories of heat are released. 1.72 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? 0.81 B) N2 (g) + O2 (g) 2NO (g) 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. 234) Work, w, is the energy transferred when an object is caused to move a distance, d, against a force, F. Mathematically, we would write this as w=Fd. 46) C) slow the reverse reaction only Which of the following statements is TRUE? H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 D. 1, The equilibrium constant is given for two of the reactions below. C 185 966) Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.] . Strong bonds break and weak bonds form. E. There is not enough information to calculate the Kw. 880) D) 2500 The equilibrium constant K will increase above 2.010-3. What is the vapor pressure of propane at 25.0 C? B. C) roughly equal amounts of products and reactants are present D. SiF4 D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. Give the direction of the reaction, if K >> 1. Part B: Calculate the boiling point of the solution above. 2CH3NO2(l)+3/2O2(g)2CO2(g)+3H2O(l)+N2(g) Hrxn = -1418 kJ] 224) Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). For the reaction H2(g) + I2(g) 2HI(g) The equilibrium constant Kp What is the best strategy while answering the Multiple Choice Questions for exams? When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. User Agreement,Privacy Policy 32) Hydrogen and iodine react to form hydrogen iodide, like this: H_2 (g HNO2 4.6104 1) Since there is not a viable alternative for it. D. +473 kJ Test your critical thinking abilities by noting the Chemistry Multiple Choice Questions with Answers for Class 12 PDF all alone. H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? D) at low temperature and high pressure H2 + I2 = HI - Chemical Equation Balancer D. capillary action C. +873 J mol-1 France, (+ Note: Names of real elements have been changed to 'Xx' and 'Xa'. Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. 380) D. 12.9 kJ [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] 9.64 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. Is Why I2 H2 A Explain A And Gas Is Solid - mon.confael.lazio.it 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] C) N2 (g) + 3H2 (g) 2 NH3 (g) United Kingdom, (+ (R = 0.0821 L atm/ (K mol)) A. Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. Spain, (+ 971) 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. E. increase pressure, The following reaction is exothermic. Which metal in the list is the best reducing agent? 960) 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ United Kingdom, (+ B) 1.56 104 United Arab Emirates, (+ Consider the equilibrium of two (ideal) gases according to 2A A2 with equilibrium constant K = 2.010-3 at a pressure of 1 bar and 30C. Russia, (+ [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] - A liquid can be converted to a gas by heating. 224) [A solution contains a mixture of pentane and hexane at room temperature. (Methanol ( CH3OH ) contains hydrogen directly bonded to oxygen, so it has hydrogen bonding. Ukraine, (+ B. B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. A) N2 (g) + 3H2 (g) 2NH3 (g) 2 NO (g) N2 (g) + O2 (g). D) increase the value of the equilibrium constant Russia, (+ A reversible reaction can proceed in both the forward and backward directions. B. E. -1.35C. You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. 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. Mexico, (+ 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 B. hydrogen bonding 351) D. 173 g A. Xd + 2 H+ Xd2+ + 2 H2 Substance Hf (kJ/mol) Part A: What is the value of E for the combustion of the fuel? Which one? There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. Nigeria, (+ A. A. Download the Study24x7 App, so you can connect and collaborate. - A gas can be converted into a liquid by increasing the pressure of a gas sample. One of these substances is a liquid at room temperature. Each question has four options followed by the right answer. PDF Chapter 17 Equilibrium: the Extent of Chemical Reactions E. 8.89. Bahrain, (+ Nigeria, (+ Formation of HI from H2 and I2 - Equilibrium constants in terms of . Q: What is the mole fraction of hexane? D. Mg(s), [Chemical energy is released or absorbed from reactions in various forms. Germany, (+ D. Energy is neither created nor destroyed, excluding nuclear reactions. At equilibrium the total pressure in the container is 1.300 atm. Xn2+ + 2 e- Xn(s) : E = 1.33 V After equilibrium was reached, the partial pressure of NO dropped to 320 torr. AB2(g) + B(g) AB3(g) Kc = ? 41) 6.41 E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 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. E. 5.01 torr. A) N2O4 (g) 2NO2 (g) 995) D.2.08 10-2 J Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. What is the boiling point of water at an elevation of 1.00104 ft ? PDF 5.9 10 -3 - gccaz.edu A. increase product A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. 64) 15.2: The Equilibrium Constant (K) - Chemistry LibreTexts Given: D. 0.420 For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction 358) PPT Chemical Equilibrium - Berkeley City College 0.21 M B. Considering H2(g) + I2(g) 2HI and a temperature of 731K; 2.40 mol of D) N2 (g) + 3H2 (g) 2NH3 (g) We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. For the reaction H2(g) + I2(g) 2HI (g), the standard free energy is G^ > 0. 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) South Korea, (+ C) [H+][HCO3-] / [CO2][H2O] B. A. B) [CO2] / [H+][HCO3-] 2HI leftharpoons H2 + I2 . Kp is - Tardigrade B. is Keq = 3.6 10-3 at 999 K. At equilibrium, ________. 91) Utilizing the assets accessible you can score well in the test. -69.8 J mol-1 The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. +25.5 kJ CH4(g)+Cl2(g)CH3Cl(g)+HCl(g), H=99.60 kJ 855) Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? * Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project H2 (g) + I2 (g) 2HI (g) E. In equilibrium, the ratio [P] / [A] is equal to k / k'. B. D. -150. kJ 93) In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends Initially, the vessel contains only X2 at a pressure of 1.75 atm. Understudies who are concentrating in CBSE, ICSE, IGCSE schools as well as different State Board schools. 263) C) roughly equal amounts of products and reactants are present C) K does not depend on the concentrations or partial pressures of reaction components. B. B. PDF Chapter 15 Practice Questions - umb.edu Equilibrium Constant Kp: Expression, Equation | StudySmarter C. K>1 What is the vapor pressure of propane at 20.0 C? 0.183 Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? Equilibrium constant expression in terms of partial pressures B) [SO2] / [SO3] C. State functions do not depend on the path taken to arrive at a particular state. 46) Calculating equilibrium constant Kp using partial pressures - Khan Academy A) increase the rate of the forward reaction only and A closed vessel at 400 K is charged with 1.00 atm of Br2 (g), 1.00 atm of Cl2 (g), and 2.00 atm of BrCl (g). [Nickel and aluminum electrodes are used to build a galvanic cell. C. 50.0 g Al, CAl = 0.903 J/gC Hungary, (+ 0.093 M NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. 91) 2A(g) + B(g) A2B(g) Kc = ? Or if any of the following reactant substances I2 (iodine), disappearing Georgia, (+ How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? Xx+(aq) + e-(aq) Xx(s) , 263) E) only reactants are present, 24) The equilibrium constant for the gas phase reaction 855) Nepal, (+ B. Intramolecular forces B. C. The value of K remains, but the equilibrium is shifted towards more reactants. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. A(g) + 2B(g) AB2(g) Kc = 59 Top 2 posts Page 1 of 1 \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ - A liquid can be converted to a gas by cooling. Albania, (+ Le Chtelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction ________. Q: Calculate mole fraction of the solution. Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. South Africa, (+ B. C. The reaction mixture will contain equal concentrations of A and B. Sweden, (+ A. H2(g) Provide your answer in units of volts (V).
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in chemical equation h2+i2=2hi the equilibrium constant kp depends on