107 g B. What is the primary source of water stored in an aquifer? What is the stoichiometric coefficient of Xx(s) in the balanced reaction equation for that cell ? 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) 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: A. D. Energy is neither created nor destroyed, excluding nuclear reactions. Pakistan, (+ Ukraine, (+ E) in the presence of solid carbon, 35) The effect of a catalyst on an equilibrium is to ________. A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. E. CP is always at a lower temperature relative to TP. Bahrain, (+ The vapor pressure of a certain sample has been measured at two different temperatures and the results are P1 = 160 kPa at T1 = 240 K and P2 = 840 kPa at T2 = 270 K. Determine the molar vaporization enthalpy, Hvap, from these results. A) products predominate A. Which statement is true at equilibrium? C) N2 (g) + 2O2 (g) 2NO2 (g) . 9.64 C. 3.42 torr H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 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. C) 0.020 C) 5.4 1013 A. 90) C-H 414 Q: Find the volume of methane measured at 298 K and 1.72 atm required to convert 0.620 L of water at 298 K to water vapor at 373 K. The enthalpy change for converting 1.00 mol of ice at -50.0C to water at 70.0C is __________ kJ. [Consider these two acids and their Ka values: A 250 mL sealed flask contains 0.65 g of butane at 22C.] Saudi Arabia, (+ 380) E) Q is the same as Keq when a reaction is at equilibrium. How is vapor pressure related to temperature? What is the standard free energy change (Grxn) for this reaction? E. 2.11, From Midterm Exam 2: 230) D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. Enter the email address you signed up with and we'll email you a reset link. Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. What is the best strategy while answering the Multiple Choice Questions for exams? E. -91 kJ, Identify an element that is NOT in its standard state. D. At any time, the ratio [P] / [A] is equal to k' / k. Nigeria, (+ 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. A. From Midterm 3: Albania, (+ E) [H+][HCO3-], 18) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. New Zealand, (+ What is the specific heat of benzene? Check all that apply. 992) E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? Ti (s) + 2Cl2 (g) TiCl4 (l) 0.13 M C. 4.3 M D. 0.039 M 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? Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is higher than the rate of the reverse reaction. A. [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] (Pg.5) (c) Isobaric process:- An isobaric process is In a homogeneous equilibrium, all the defined as one in which the pressure of the reactants and products are in the same phase. N2(g) + O2(g) 2 NO(g) Hrxn = +183 kJ D. CO 358) Which statement is true of an endothermic reaction? E. none of the above. Swaziland, (+ The equilibrium constant K will increase above 2.010-3. [Nickel and aluminum electrodes are used to build a galvanic cell. B. NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. United Arab Emirates, (+ HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. 233) This multitude of MCQs with answers are delivered by subject specialists for a wide range of understudies. B) N2 (g) + O2 (g) 2NO (g) C. 1.92 x 103 kJ/mole A -253 A. Erxn can be determined using constant volume calorimetry. . B. 82) E. 25.0 g Au, CAu = 0.128 J/gC, Calculate the change in internal energy (E) for a system that is giving off 25.0 kJ of heat and is changing from 18.00 L to 15.00 L in volume at 1.50 atm pressure. 2A+B2C+2D B) reactants predominate A. 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 . Mauritius, (+ 0.093 M Which metal ion in the list is most difficult to reduce? C. 0.00048 [An aqueous solution contains 32% HCl by mass] B. E. There is not enough information to calculate the Kw. NO(g)+12Br2(g)NOBr(g)Kp=5.3 Strong bonds break and weak bonds form. South Africa, (+ 41) C=O 799 Note: Names of real elements have been changed to 'Xs' and 'Xo'. Q: What is the [H3O+] in pure water at body temperature? So Kp = (PH2) x (PI2) / PHI^2 P = partial pressure 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? D) N2 (g) + 3H2 (g) 2NH3 (g) B. A 20.0kg20.0 \mathrm{~kg}20.0kg crate sits at rest at the bottom of a 15.0m15.0 \mathrm{~m}15.0m long ramp that is inclined at 34.034.0^{\circ}34.0 above the horizontal. 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] Q: What is the percent ionization of ammonia at this concentration? Georgia, (+ Which one statement regarding the first-order reaction 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? 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. Ag+(aq)+eAg(s)Co2+(aq)+2eCo(s)Cu2+(aq)+2eCu(s)Pb2+(aq)+2ePb(s)Zn2+(aq)+2eZn(s)voltage=+0.80Vvoltage=0.28Vvoltage=+0.34Vvoltage=0.13Vvoltage=0.76V. A) products predominate E) all of the above, 32) Consider the following reaction at equilibrium: 968) Essentt - Handpicked Products. Part A: What is the value of E for the combustion of the fuel? - A gas can be converted into a liquid by cooling. - A gas can be converted into a liquid by heating. B. +25.5 kJ D. 0.117 M H 2(g) +I 2(g) 2H I (g) Nepal, (+ 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. density Business, Finance, Economics, Accounting, Operations Management, Computer Science, Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical . E. 1.62. A. A. B. K=0 32) A) products predominate C. 55.8 C ), [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Sweden, (+ Use Q to determine which of the statements below is true. h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. After the reaction reaches equilibrium, the total pressure is 2.65 atm.] 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. 46) [A redox reaction has an Ecell=1.00V] B. [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] A. Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. D. 40.5C E. All of the above are true. Poland, (+ Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. C. Xd2+ + 2 H+ Xd + H2 Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ 977) 7) Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. D. 4.60. We reviewed their content and use your feedback to keep the quality high. C) 2 SO3 (g) 2 SO2 (g) + O2 (g) A. [A solution contains a mixture of pentane and hexane at room temperature. A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. Albania, (+ Pakistan, (+ C. The reciprocal concentration, [A]-1, changes linearly with time. E. dispersion. - A gas can be converted into a liquid by increasing the pressure of a gas sample. CH4(g)+2Cl2(g)CH2Cl2(g)+2HCl(g) 07 H2(g) Nonmetal Gas 2 00 L container and goes to equilibrium at 200 oC 00 L container and goes to equilibrium at 200 oC. Q2. 971) subject to the given initial conditions. 44) Mauritius, (+ Kc depends on how the chemical equation is written, but not on how the reaction is carried out. Guinea, (+ Q6. Determine the value of the missing equilibrium constant. N2 (g) + 3H2 (g) 2NH3 (g) Nigeria, (+ E. 0.169 M, From Midterm Exam 2: Sweden, (+ B. From Midterm 3: 9) The equilibrium expression for Kp for the reaction below is ________. For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . 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. 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). E) [F-] / [HF], 19) The expression for for the reaction below is ________. 2 NO(g) + O2(g) ' 2 NO2(g) A. ethanol [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. United Kingdom, (+ Use the bond energies provided to estimate Hrxn for the reaction below. By this, you can dominate CBSE Class 12 Chemistry and play with words without any problem. For these conditions, what is the value of Kp for the reaction that occurred: 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. D. 1, The equilibrium constant is given for two of the reactions below. Cambodia, (+ You'll get a detailed solution from a subject matter expert that helps you learn core concepts. The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). B. Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. - A gas can be converted into a liquid by increasing the pressure of a gas sample. Cambodia, (+ C. 16.6 kJ 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. CBSE MCQs for all the classes and subjects are provided online or you can view them on our site. 2 SO2(g) + O2(g) 2 SO3(g) 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 ? Where to download CBSE MCQs for all Classes and Subjects? (Hint: Start with calculating the pH as if this were a monoprotic acid.) 2HI (g) H2 (g) + I2 (g) 358) (iii) The total pressure increases as the system approaches equilibrium. 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] What is the boiling point of water at an elevation of 1.00104 ft ? }}+5y=26e^{3t},~~~~~y_{0}=1,~y_{0}^{^{\prime }}=5. What happens to the vapor pressure of a substance when the temperature is increased? A. Xd + 2 H+ Xd2+ + 2 H2 C. H3O+/OH- 351) According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? Zimbabwe, (+ C. surface tension Identify the change that will always shift the equilibrium to the right. Georgia, (+ (b)(b)(b) How much time does it take the crate to travel to the top of the ramp? The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. This buffer has a pH = 4.74. B. 960) Q: Calculate the molality of the solution. A. F2 [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] H2 (g) + I2 (g) <------------------> 2 HI (g) y+4y+5y=26e3t,y0=1,y0=5. 64) 64) 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question 93) 1.00 10-14 Give the direction of the reaction, if K >> 1. A.1.89 103 J PART A: D. 173 g 234) At equilibrium, ________. 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. 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. Xd(s) | Xd2+(aq) || H+(aq) | H2(g) | Pt B) Keq does not change with temperature, whereas Q is temperature dependent. Q: At what temperature does benzene boil when the external pressure is 460 torr ? B. It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. 1.14 J/(g C) The law of ________ states that energy that can be neither created or destroyed. For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? -25.5 kJ Q: If the initial concentration of SO2Cl2 is 1.00 M, how long will it take for the concentration to decrease to 0.72 M ? The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] From Midterm Exam 2: B. 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ 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) . France, (+ Understudies who are planning for serious assessments like NTSE, Olympiad, and so forth for class 12. India, (+ D) only products are present Nepal, (+ 977) 90) is Keq = 4.34 10-3 at 300 C. H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 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. 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} 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. Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. 2SO2 (g) + O2 (g) 2SO3 (g) CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) The heat capacity of the calorimeter is 4.90 kJ/C. It permits everybody to download CBSE Class 12 Chemistry Chapter-wise MCQs question keep money with addresses in free pdf organization and practice them for additional investigations. D. +473 kJ How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? 2HI(g); Equilibrium is the exact balancing of two opposing processes. \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ From Midterm Exam 2: For the reaction H2(g) + I2(g) 2HI (g), the standard free energy is G^ > 0. C. -2.97C B. C. HF 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] Part C: Calculate the change in the internal energy of the system, E. 2075 Maldives, (+ 2003-2023 Chegg Inc. All rights reserved. The value of pH is somewhat higher than 2.13. [Acid rain over the Great Lakes has a pH of about 4.6.] B) a decrease in the total pressure (T constant) An equilibrium mixture contains 2 moles of sulphur dioxide, 1 mole of oxygen and 6 moles of sulphur trioxide. Weak bonds break and strong bonds form. at a certain temperature. Egypt, (+ C. 1.28 Nigeria, (+ AB2(g) + B(g) AB3(g) Kc = ? E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? 351) [A] and [P] denote the concentrations of A and P, respectively. Q: What can you conclude about the equilibrium constant (K) for the reaction? 52) E) 2 Fe2O3 (s) 4 Fe (s) + 3O2 (g), 30) Based on Le Chtelier's principle, increasing pressure at constant temperature in the following reaction will not change the concentrations of reactants and products. Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. A) at high temperature and high pressure 968) 7154 Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? C) 6.44 105 33) C. The value of pH is 6.65. H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. 20) Spain, (+ Experts are tested by Chegg as specialists in their subject area. 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. where n represents the stoichiometric coefficients] Belgium, (+ E. Xe. A. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. D. Xd + H+ Xd2+ + H2 + Pt 995) All the Solutions are explained in a comprehensive manner and are recommended by many subject experts. B. hydrogen bonding [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] Germany, (+ 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. Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? 7) A. 12.30 C. 12.54 O-H 464 To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. 971) India, (+ PART B: Equilibrium constant expression in terms of partial pressures D. The value of pH is somewhat lower than 2.13. C. CF4 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)? View Answer Consider the following reaction: 2SO (g) + O_2 (g) to 2SO_2 (g) K_p = 36.4 at 298 K. In a reaction mixture at equilibrium, the partial pressure of SO is 0.46 atm and that of SO_2 is. Check all that apply. 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. Both TP and CP are located on the solid/liquid phase boundary. 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. B. A. 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. Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. HNO2 4.6104 D. CH3OH, D. CH3OH Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. Q7. What is the value of Keq for the following reaction? - A gas can be converted into a liquid by decreasing the pressure of a gas sample. Russia, (+
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