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. E. -91 kJ, Identify an element that is NOT in its standard state. 960) D. all of the above Please Help 1. In an experiment, 1.0 mol each of H 2 (g) and I Formation of HI from H2 and I2 - Equilibrium constants in terms of O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). What is the rate constant, k, for this reaction in units of L mol-1 s-1. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction 44) 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? Qc = 0.120 < Kc reaction proceeds to products. C. 2.13 10-14 E. In equilibrium, the ratio [P] / [A] is equal to k / k'. E. H3O+. D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture D) only products are present E. increase pressure, The following reaction is exothermic. A) N2O4 (g) 2NO2 (g) 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. 28.4 kJ South Korea, (+ 995) C) [SO3]2 / [SO2]2[O2] The formation of HI from H2 and I2 is an example of gaseous homogeneous equilibrium reaction. Equilibrium hydrogen is defined as a sample of hydrogen existing at the equilibrium ratio of orthohydrogen-parahydrogen at a given temperature (shown by the crimson dash-dot line in the figure). C) at low temperature and low pressure What is the primary source of water stored in an aquifer? 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. PPT PowerPoint Presentation B. NaCl A. 358) D. Xd + H+ Xd2+ + H2 + Pt The equilibrium constant K will increase above 2.010-3. C. Xd2+ + 2 H+ Xd + H2 Rehearsing NCERT Online Chemistry MCQ Questions for Class 12 with Answers is perhaps the most effective way to plan for the CBSE Class 12 board test. D) a decrease in the total volume of the reaction vessel (T constant) Mexico, (+ Phenomenon after H2 (hydrogen) reacts with I2 (iodine) This equation does not have any specific information about phenomenon. 973) United Kingdom, (+ 34) D) increase the value of the equilibrium constant N2(g)+O2(g)+Br2(g)2NOBr(g). [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] Determine the partial pressure of each gas at equilibrium. HI(g)12H2(g)+12I2(g), The equilibrium constant is given for one of the reactions below. H2 (g) + I2 (g) <------------------> 2 HI (g) Which statement is true of an endothermic reaction? C. 62.5C CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions. A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. After the reaction reaches equilibrium, the total pressure is 2.65 atm.] 44) is first order in CH3NC. Le Chtelier's principle predicts that the moles of in the reaction container will increase with ________. 49) The amount of 2.62 mol of a sugar is added to 1.64 kg of pure water at standard pressure. [Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. D. 0.117 M D. C2H3O2-/HC2H3O2 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. At equilibrium, ________. E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? Q7. D) 2 SO3 (g) 2 SO2 (g) + O2 (g) C. 840 J What factors cause changes between the liquid and gas state? D. Energy is neither created nor destroyed, excluding nuclear reactions. For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Archived Questions & Answers - Page 1134 - Answer Happy C) roughly equal amounts of products and reactants are present What is the vapor pressure of propane at 25.0 C? [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ (R = 0.0821 L atm/ (K mol)) A. From Midterm 3: [An aqueous solution contains 32% HCl by mass] D. increase reactant Maldives, (+ Zimbabwe, (+ 2NH3 (g) N2 (g) + 3H2 (g) D) 2500 [Acid rain over the Great Lakes has a pH of about 4.6.] H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 Cambodia, (+ B) N2 (g) + O2 (g) 2NO (g) 91) PDF 5.9 10 -3 - gccaz.edu E) an increase in total pressure by the addition of helium gas (V and T constant), B) a decrease in the total pressure (T constant), 33) Consider the following reaction at equilibrium: For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. 233) 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? Hydrogen bonding is a strong intermolecular force that makes this substance a liquid at room temperature), Identify the term used to describe the ability of a liquid to flow against gravity up a narrow tube. The molar mass of sugar is 342.3 g/mol. 230) Finland, (+ Denmark, (+ 64) United Arab Emirates, (+ 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. D. 5.50 10-14 Ti (s) + 2Cl2 (g) TiCl4 (l) 380) A. 48.6 C 57.0 kJ Key points. B) H2 (g) + Cl2 (g) 2 HCl (g) 268) A. The standard reduction potential for the nickel(II) ion is 0.26 V and that of the aluminum(III) ion is 1.66 V] Understudies who wish to hone their insight into Chemistry. What is the need of NCERT Solutions and CBSE MCQs? C. raising the temperature At 100 C and 1 atm, water is in which phase? Equilibrium Constant Kp Definition And Examples - Chemistry Dictionary Thank you for your participation! E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? is Keq = 2.80 102 at 999 K. At equilibrium, ________. Here's an example. 2HI (g) H2 (g) + I2 (g) A) 100 B) 0.50 C) 0.020 D) 2500 E) -50 C) 0.020 13) The Keq for the equilibrium below is 50. Netherlands, (+ D) The reaction is at equilibrium when Q > Keq. One of these substances is a liquid at room temperature. A(g) + 2B(g) AB2(g) Kc = 59 United States, (+ C. 0.00048 Science Chemistry For the following reaction, 2HI(g) --> H2(g) + I2(g) a. B. 64) 12.30 234) After 203 s the concentration of A had fallen to one fifth of the initial value. B. Guinea, (+ B) [(NH4)2Se] / [NH3]2[H2Se] A.1.89 103 J 3.48 J/(g C) D. CH3OH, D. CH3OH Belgium, (+ For these conditions, what is the value of Kp for the reaction that occurred: Nigeria, (+ You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. [Consider these two acids and their Ka values: Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? Maldives, (+ [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. What Is The Equilibrium Expression For H2 I2 2Hi? Quick Answer From Midterm 3: A. 45) B. D) only products are present H2(g) + I2(g) . This multitude of MCQs with answers are delivered by subject specialists for a wide range of understudies. Given: Half-reaction reaction potentials you might need are: Nigeria, (+ D. 12.79 880) E) decrease the partial pressure of CO, D) increase the value of the equilibrium constant, 34) Consider the following reaction at equilibrium. A P Georgia, (+ - The vapor pressure of a liquid increases with increasing temperature. 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 . 355) D. 39.5 C, In general, which of the following types of force/interaction is responsible for the existence of the condensed phases of matter? NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. C. 16.6 kJ Turkey, (+ * Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project - The relationship between vapor pressure and temperature is linear. Considering H2(g) + I2(g) 2HI and a temperature of 731K; 2.40 mol of B. 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. Xd + 2 H+ Xd2+ + H2. H 2(g) +I 2(g) 2H I (g) Ghana, (+ Pakistan, (+ - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? C. +115 kJ CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. E. 13.02, From Midterm Exam 2: B. A) at high temperature and high pressure D. 0.087 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. E. There is not enough information to calculate the Kw. [A] and [P] denote the concentrations of A and P, respectively. C) N2 (g) + 2O2 (g) 2NO2 (g) A) products predominate 1.72 Substance Hf (kJ/mol) B. A second-order reaction of the type 2A P was carried out in a solution with the initial concentration of A being [A]0 = 1.5 mol L-1. Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? B. The most easily measurable form of energy comes in the form of heat, or enthalpy. From Midterm 3: B. D) 1.90 1019 B) reactants predominate South Africa, (+ Polyoxometalate Molecular Science [PDF] [534rrp5c23v0] 2 SO2(g) + O2(g) 2 SO3(g) D) [SO3]2 / [SO2]2[O2]2 A. 30.5 C D) 2HI (g) H2 (g) + I2 (g) 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) decrease the value of the equilibrium constant France, (+ 31) E. Xe. Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. The equilibrium constant (K ) would be __________.

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