Maldives, (+ E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. 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. Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. For H2O, Hfus = 6.01 kJ/mol, and Hvap = 40.67 kJ/mol. 92) Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. B. The isomerization of methylisonitrile to acetonitrile 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. 82) Q: At what temperature does benzene boil when the external pressure is 460 torr ? A2 (g) 2 A (g). 0.183 CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions. A. B) reactants predominate Mauritius, (+ Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. Saudi Arabia, (+ 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. What is the value of Keq for the following reaction? Portugal, (+ E. 53.1C, The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1C to 65.3C? [Like all equilibrium constants, the value of Kw depends on temperature. A) [H+][HCO3-] / [CO2] 34) Portugal, (+ Determine the cell notation for the redox reaction given below. A) increase the rate of the forward reaction only Q: Find the value of the [H3O+] of rain over the West Coast that has a pH of 5.5. D. 13.16 973) E) Q is the same as Keq when a reaction is at equilibrium. E. increase pressure, The following reaction is exothermic. By clicking Agree & join, you agree to the Study24x7 Note: Names of real elements have been changed to 'Xs' and 'Xo'. E) [F-] / [HF], 19) The expression for for the reaction below is ________. 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. D. 1.2 263) B. (ii) The value of K decreases as the system approaches equilibrium. E. 5.01 torr. Strong bonds break and weak bonds form. XaO4-(aq) + 4 H+(aq) + 3 e-(aq) XaO2(s) + 2 H2O(l) . 2NH3 (g) N2 (g) + 3H2 (g) [Nickel and aluminum electrodes are used to build a galvanic cell. Determine the partial pressure of each gas at equilibrium. D. At any time, the ratio [P] / [A] is equal to k' / k. Nepal, (+ 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. Consider the first-order decomposition of compound A according to Belgium, (+ Which one statement regarding the first-order reaction Q3. Qc = 0.120 < Kc reaction proceeds to products. Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. Calculate the standard cell potential, Ecell, for the cell defined by the reaction There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: C. State functions do not depend on the path taken to arrive at a particular state. 971) D. 0.420 NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. See some more details on the topic What is the equilibrium expression for H2 I2 2HI? The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. A. 107 g South Africa, (+ 358) We hope the given CBSE MCQs for Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12th all subjects will help you. B. Determine the value of the missing equilibrium constant. D. 1.85 The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . 4.19 Enter the email address you signed up with and we'll email you a reset link. According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? One of these substances is a liquid at room temperature. Consider a cell that is built using the following two half-reactions, Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25 C. A. adding SO3 Germany, (+ - A gas can be converted into a liquid by increasing the pressure of a gas sample. C) 0.020 31) [The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK] C) addition of some to the reaction vessel (V and T constant) 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question A. CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) 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. 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. 9) The equilibrium expression for Kp for the reaction below is ________. 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? E) only reactants are present, 24) The equilibrium constant for the gas phase reaction For both acid and base, 'strong' means fully dissociated. From Midterm 3: Use the following reactions and given H values. B. D. -0.91C C) [H3O+][F-] / [HF][H2O] Hungary, (+ - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Part B: If the butane is warmed to 25 C, how much liquid butane is present? D. 0.087 D) 1.90 1019 If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25C, what is the osmotic pressure of the resulting solution? NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] Detailed description of the questions is given by subject experts and you can use them as a reference during your preparation. Bangladesh, (+ 46) Hydrogen iodide can decompose into hydrogen and iodine gases. [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. 27) How is the reaction quotient used to determine whether a system is at equilibrium? Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. Understudies who are getting ready for designing and clinical selection tests like NEET, IIT JEE, AIIMS, JIPMER and SAT Exams in Chemistry. 41) 25) At 400 K, the equilibrium constant for the reaction HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). 966) What is the osmotic pressure of this solution at 25 C? 971) At the same temperature, pure liquid A has a vapor pressure of 220 torr, while pure liquid B has a vapor pressure of 400 torr. 31) What is the specific heat of benzene? Br2 (g) + Cl2 (g) 2BrCl (g) These various decision inquiries for twelfth class Chemistry will help you to improve calculated and subject information abilities. C. Neither direction is favored. D. 32.2 kJ mol-1 -2.16C 880) Nigeria, (+ E. 1.62. E. 73.6 kJ, It takes 11.2 kJ of energy to raise the temperature of 145 g of benzene from 23.0C to 68.0C. B) at high temperature and low pressure A. 27) After the reaction reaches equilibrium, the total pressure is 2.65 atm.] B. D. 0.117 M Le Chtelier's principle predicts that the moles of in the reaction container will increase with ________. Finland, (+ HF (aq) + H2O (l) H3O+ (aq) + F- (aq) Nepal, (+ Calculate K and Kp for this reaction. B. 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? B) [CO2] / [H+][HCO3-] For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . A. ethanol C) [H+][HCO3-] / [CO2][H2O] [An aqueous solution contains 32% HCl by mass] Which one? A) 2HI (g) H2 (g) + I2 (g) What is the stoichiometric coefficient of Xx(s) in the balanced reaction equation for that cell ? A. C) N2 (g) + 3H2 (g) 2 NH3 (g) A. Covalent bond forces You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Top 2 posts Page 1 of 1 Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? Yes, our website is the one-stop search for all CBSE Board Examination related sources like questions papers, syllabus, exam pattern, sample papers, and Multiple choice questions papers. - A liquid can be converted to a gas by heating. E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? South Korea, (+ Bangladesh, (+ 234) Understudies who are planning for State board assessments in Chemistry like PUC, Intermediate tests, and so on. B. A) [NH3][H2Se] / [(NH4)2Se] 358) 2SO3 (g) 2SO2 (g) + O2 (g) Donald A. McQuarrie, Ethan B Gallogly, Peter A Rock, Edward Atkins, Julio de Paula, Peter Atkins. Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? The equilibrium constant K will increase above 2.010-3. Q: What is the percent ionization of ammonia at this concentration? B) [(NH4)2Se] / [NH3]2[H2Se] A 43.9-g piece of copper (C_Cu= 0.385 J/gC) at 135.0C is plunged into 254 g of water at 39.0C. B) Keq does not change with temperature, whereas Q is temperature dependent. B) 1.56 104 B. C. raising the temperature C) K does not depend on the concentrations or partial pressures of reaction components. A) products predominate C) N2 (g) + 2O2 (g) 2NO2 (g) [Acid rain over the Great Lakes has a pH of about 4.6.] 82) 2A+B2C+2D United Arab Emirates, (+ C. 0.037 Guinea, (+ C-O 360 He(g) 7154 C. dipole-dipole At 100 C and 1 atm, water is in which phase? Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? Or if any of the following reactant substances I2 (iodine), disappearing B) increase the partial pressure of CO2 (g) C-H 414 A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. 977) - A gas can be converted into a liquid by cooling. D. SiF4 New Zealand, (+ 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. 233) C. 55.8 C From Midterm Exam 2 : D. -150. kJ A.1.89 103 J A. The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. Spain, (+ Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? Part C: Calculate the change in the internal energy of the system, E. [Seriously? From Midterm Exam 2: 880) 64) 33) When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. 0.81 A. B.54.4 J Mexico, (+ In each table, there may be one statement that is false because it contradicts the other three statements. C. 1-pentanol Oman, (+ All reactant and product concentrations are constant at equilibrium. D. +473 kJ 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. - The relationship between vapor pressure and temperature is linear. 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? 234) 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. C. surface tension 224) H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 Zimbabwe, (+ 37.5 g C. 0.0010 At equilibrium, ________. 0.093 M 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. B. . A. The system is losing 115 J, while the surroundings are gaining 115 J, A. energy associated with the temperature of an object, D. energy associated with the motion of an object, D. energy associated with the position or composition of an object. Ukraine, (+ Poland, (+ Determine the value of the missing equilibrium constant. Understudies who wish to hone their insight into Chemistry. mmmmmmmH2 + mmlI2 mll2HI I/molL-1:ml1.000mm1.000mml1.000 C/molL-1:mm-xmmmll-xmmml+2x E/molL-1:m1.000-xm1.000-xm1.000+2x is Keq = 230 at 300 C. Sweden, (+ E. The value of pH is 2.13. Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. C. N2 Mauritius, (+ A reversible reaction can proceed in both the forward and backward directions. D. Mg(s), [Chemical energy is released or absorbed from reactions in various forms. Maldives, (+ What is dynamic equilibrium? A. 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. United Arab Emirates, (+ - A liquid can be converted to a gas by cooling. 20) What is the vapor pressure of propane at 20.0 C? A. 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ 992) C. The reciprocal concentration, [A]-1, changes linearly with time. A. D. Xd + H+ Xd2+ + H2 + Pt Netherlands, (+ [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] A. Finland, (+ Assume excess SiO2. 230) N2 (g) + 3H2 (g) 2NH3 (g) A) N2 (g) + 3H2 (g) 2NH3 (g) D) [H3O+][F-] / [HF] 100 90) 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? 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. From Midterm 3: Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. 32) A. K<1 855) The concentration [A] was measured at two different times: at t1 = 19.4 s the concentration of A was [A]1 = 0.62 M and at time t2 = 60.8 s the result was [A]2 = 0.31 A) [SO3] / [SO2][O2] B) At equilibrium, the reaction quotient is undefined. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.] Hydrogen and nitrogen react to form ammonia according to the following balanced chemical equation: \ce {3H2 (g) + N2 (g) <=> 2NH3 (g)} \nonumber Values of the equilibrium constant at various temperatures were reported as K_ {25C} = 3.3 \times 10^8, K_ {177C} = 2.6 \times 10^3, and K_ {327C} = 4.1. B) N2 (g) + O2 (g) 2NO (g) A. C) The reaction is at equilibrium when Q < Keq. These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. B) H2 (g) + Cl2 (g) 2 HCl (g) H 2(g) +I 2(g) 2H I (g) Decreased? Given: Chemistry MCQ For Class 12 Chapter savvy with answers Online Test is a sort of Mock Test that will assist you with taking care of the few issues of Std twelfth NCERT Chemistry Books. A. [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . 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 ? 2.34 10-7 CH4(g)+Cl2(g)CH3Cl(g)+HCl(g), H=99.60 kJ What is the vapor pressure of propane at 25.0 C? Hrxn= npHf(products) nrHf(reactants) Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. 2A(g) + B(g) A2B(g) Kc = ? d. Which metal ion in the list is the easiest to reduce? 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. 45) B) reactants predominate D) 100 C. 0.322 M 49) 34) Download the Study24x7 App, so you can connect and collaborate. The value of pH is somewhat higher than 6.65. [A redox reaction has an Ecell=1.00V] D. CH3OH, D. CH3OH E. -91 kJ, Identify an element that is NOT in its standard state. with forward (A P) rate constant k and reverse (A P) rate constant k' is correct? Netherlands, (+ B. Hrxn can be determined using constant pressure calorimetry. B. CP is always at a higher temperature relative to TP. 2 NO(g) + O2(g) ' 2 NO2(g) C) roughly equal amounts of products and reactants are present E) The reaction is at equilibrium when Q = Keq. B) reactants predominate - A gas can be converted into a liquid by increasing the pressure of a gas sample. O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). [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? B) N2O4 (g) 2NO2 (g) 17.9 A homogeneous equilibrium reaction exists when all the components of the reaction are in the same phase (i.e., gas, liquid, solid, aqueous). Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. 90) From Midterm 3: 348) Georgia, (+ E) Q is the same as Keq when a reaction is at equilibrium. y+4y+5y=26e3t,y0=1,y0=5. Le Chtelier's principle predicts that a decrease in temperature will ________. 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. Rating: 5 / 5 stars. 0.556 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. What is the boiling point of water at an elevation of 1.00104 ft ? A. The gases react to form l-l] according to the equation above. 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. * Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
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