B. Swaziland, (+ D. - 1.23 x 103 kJ/mole. H2 (g) + Br2 (g) 2 HBr (g) Albania, (+ 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. - A liquid can be converted to a gas by cooling. B) N2 (g) + O2 (g) 2NO (g) D. 0.420 United States, (+ 224) By rehearsing more second Year Chemistry MCQs with Answers Pdf Download, understudies can work on their speed and exactness which can help them during their board test. H2(g) + I2(g) 2HI(g) At equilibrium, the mixture is found to contain 1.580 mole of HI. If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium? D. 4.60. D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. -333 kJ B. increase volume Since there is not a viable alternative for it. Maldives, (+ For a process at constant pressure, 49,600 calories of heat are released. 995) For benzoic acid, Ka=6.5105. 44) PART B: D. C2H3O2-/HC2H3O2 30.5 C E. In equilibrium, the ratio [P] / [A] is equal to k / k'. 4.19 B. Hrxn can be determined using constant pressure calorimetry. A. The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. A. PO43- Hydrogen and iodine react to form hydrogen iodide, like this: H_2 (g) + I_2 (g) rightarrow 2 HI (g) Also, a chemist finds that at a certain temperature the equilibrium mixture of hydrogen, iodine, and hydrogen iodide has the following composition: Calculate the value of the equilibrium constant K_p for this reaction. E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. A) N2 (g) + 3H2 (g) 2NH3 (g) 33) H2(g)+I2(g)2HI(g) , K=6.2102 17-2 The value of Q increases as a function of time until it reaches the value of K. b) No, Q would still increase with time because the [I2] would decrease in exactly the same way as [H2] decreases. Hrxn= npHf(products) nrHf(reactants) 0.093 M Each question has four options followed by the right answer. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? A reversible reaction can proceed in both the forward and backward directions. -2.16C Determine the value of the missing equilibrium constant. E) Q is the same as Keq when a reaction is at equilibrium. 355) From the data given we can determine the starting concentrations of both H 2 and I 2 to be CH2 = nH2 V = 2.40moles 1.00L = 2.40M CI2 = nI2 V = 2.40moles 1.00L = 2.40M We can now determine the equilibrium concentrations for this reaction by using the ICE method (more here: http://en.wikipedia.org/wiki/RICE_chart) . [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] Compute the pH at 25C after 3 mL of the base has been added. 93) 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. Careful quan titative dehydration experiments [17] show that at 173 K each protonated form o f the anion has a distinct resonance, see Figure 8 . [Acid rain over the Great Lakes has a pH of about 4.6.] Strong bonds break and weak bonds form. A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values. E. methanol, Give the major force between ethanol and water. D) only products are present South Africa, (+ B. Nepal, (+ 268) 268) (Assume ideal behavior.). United Arab Emirates, (+ Here's an example. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction E. Xe. Hydrogen iodide can decompose into hydrogen and iodine gases. Switzerland, (+ Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. Q: Find the value of the [H3O+] of rain over the West Coast that has a pH of 5.5. Assume excess SiO2. 48) 10.9 kJ mol-1 A. B) 1.56 104 2 SO2(g) + O2(g) 2 SO3(g) A. 968) Bahrain, (+ [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. He(g) (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. Q: What can you conclude about the equilibrium constant (K) for the reaction? - The relationship between vapor pressure and temperature is linear. Understudies who wish to hone their insight into Chemistry. [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] A. Portugal, (+ Belgium, (+ C. raising the temperature United Kingdom, (+ 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 ? Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). A. Covalent bond forces A -253 224) E. 13.02, From Midterm Exam 2: A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. [Acid rain over the Great Lakes has a pH of about 4.6.] The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . D -511. 28.4 kJ Consider a cell that is built using the following two half-reactions, HC2H3O2 1.8105] A. 10) The Keq for the equilibrium below is 7.52 10-2 at 480.0 C. 4CuO (s) + CH4 (g) CO2 (g) + 4Cu (s) + 2H2O (g), 20) The equilibrium-constant expression for the reaction 64) 355) 2NH3 (g) N2 (g) + 3H2 (g) Q: What is the pH of a 0.240 M ammonia solution? For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. CH3NC(g) CH3CN(g) chemical equilibrium class-11 1 Answer +1 vote answered Feb 2, 2022 by Princebarnwal (34.9k points) selected Feb 6, 2022 by Jeewant Best answer For the given reaction, Kp = (pH I)2 (pH 2)(P I 2) ( p H I) 2 ( p H 2) ( P I 2) Both TP and CP are located on the solid/liquid phase boundary. D) [SO3]2 / [SO2]2[O2]2 Given: 234) 27) How is the reaction quotient used to determine whether a system is at equilibrium? E. 5.01 torr. What is the boiling point of water at an elevation of 1.00104 ft ? 973) By this, you can dominate CBSE Class 12 Chemistry and play with words without any problem. Q: Calculate mole fraction of the solution. 92) O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). What is the mole fraction xA of liquid A in this mixture. The equilibrium constant (K ) would be __________. PDF Equilibrium- HW - NJCTL 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] The value of pH is somewhat higher than 2.13. 2075 Mexico, (+ 1) E) only reactants are present, 22) The equilibrium constant for the gas phase reaction 41) [Seriously? - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. 973) 234) 880) An aqueous solution contains 0.10M H 2S and 0.20M H Cl . 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] 27) 2HI = H2 + I2 | Chemical Equation - The vapor pressure of a liquid increases with increasing temperature. From Midterm 3: The gases react to form l-l] according to the equation above. E. All of the above are true. 966) 27.3 kJ mol-1 Determine the pH value at 25C for a 0.062 M solution of a base that is 100% dissociated. 31) B. C. 55.8 C A. Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. 2SO3 (g) 2SO2 (g) + O2 (g) Russia, (+ 31) Which one? - 1.92 x 103 kJ/mole In chemical equation H2 (g) + I2 (g) 2HI (g) the equilibrium constant Kp depends on See more A total pressure B catalyst used C amount of H2 and I2 D Temperature Submit Class 12 (PCB) Class 12 (PCM) Like Comment Share Write a comment 500+ more Questions to answer Popular Courses FREE How to start preparing for IIT from Class 10th B. Note: Names of real elements have been changed to 'Xx' and 'Xa'. Oman, (+ 49) 2 HBr(g) H2(g) + Br2(g) Kc = ? 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. Swaziland, (+ Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. D) [H3O+][F-] / [HF] B. 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? E. -117 kJ. H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. Donald A. McQuarrie, Ethan B Gallogly, Peter A Rock, Edward Atkins, Julio de Paula, Peter Atkins. 0.13 M C. 4.3 M D. 0.039 M Utilizing the assets accessible you can score well in the test. The isomerization of methylisonitrile to acetonitrile Sn(s)|Sn2+(aq)NO(g)|NO3(aq),H+(aq)|Pt(s), 3Sn(s)+2NO3(aq)+8H+(aq)3Sn2+(aq)+2NO(g)+4H2O(l), [Use tabulated half-cell potentials to calculate Grxn for each of the following reactions at 25 C] A) Q does not change with temperature. 11.90 E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Asked by sumandeesinghrana | 12 Oct, 2010, 03:00: PM Expert Answer Dear Student For the reaction H 2 + I 2 --------> 2HI Initially, the vessel contains only X2 at a pressure of 1.75 atm. 52) The equilibrium constant expression for the reaction is Kc = [HI]2 [H2][I2] Substituting the equilibrium concentrations into the equilibrium expression, Kc = (0.30)2 (0.012)(0.15) = 50 The magnitude of the equilibrium constant is 50 for the temperature at which the data was collected. Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. 8) The equilibrium expression for Kp for the reaction below is ________. Give the direction of the reaction, if K >> 1. B) It is a process used for the synthesis of ammonia. D. Intermolecular forces. The molar mass of sugar is 342.3 g/mol. E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? At 100 C and 1 atm, water is in which phase? 224) Catalysts have no effect on equilibrium situations. 971) Ukraine, (+ C. The reciprocal concentration, [A]-1, changes linearly with time. B) a decrease in the total pressure (T constant) D) [CO2][H2O] / [H+][HCO3-] For H2O, Hfus = 6.01 kJ/mol, and Hvap = 40.67 kJ/mol. 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. Intramolecular forces C. The value of pH is 6.65. 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. is first order in CH3NC. Ghana, (+ Determine the cell notation for the redox reaction given below. 966) 20) - A gas can be converted into a liquid by cooling. A. increase product 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. 234) D. 1.85 [A] and [P] denote the concentrations of A and P, respectively. 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. After 203 s the concentration of A had fallen to one fifth of the initial value. 2COF2(g)CO2(g)+CF4(g), Kc=6.30 In each table, there may be one statement that is false because it contradicts the other three statements. 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. D. 1.72 J/(g C), The temperature rises from 25.00C to 29.00C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. 960) A. The equation for the dissociation of hypochlorous acid is: The reaction mixture will contain [A]=1.0M and [B]=0.1M. A. Tajikistan, (+ 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. Georgia, (+ 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. \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) & \text { voltage }=-0.76 \mathrm{~V} A. 1) Check all that apply. The equilibrium constant for the reaction H2+I2<->2HI is 54.8 at 425 PART A: These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. Afghanistan, (+ 64) D. 25.0 g granite, Cgranite = 0.79 J/gC The forward reaction is favored. B) [CO2] / [H+][HCO3-] Mexico, (+ Cambodia, (+ B. Ukraine, (+ Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. C) The reaction is at equilibrium when Q < Keq. B. - A gas can be converted into a liquid by cooling. United Kingdom, (+ How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? What is the best strategy while answering the Multiple Choice Questions for exams? A.1.89 103 J Answer 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. A) some removal of from the reaction vessel (V and T constant) 32) 2.65 Note: Names of real elements have been changed to 'Xs' and 'Xo'. C) roughly equal amounts of products and reactants are present Energy can be transferred in many ways, one of which is in the form of work. 358) B. New Zealand, (+ 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. Hydrogen iodide undergoes decomposition according to the equation 2HI (g) H2 (g) + I2 (g) The equilibrium constant Kp at 500 K for this equilibrium is 0.060. 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. You can get ready really for the Class 12 Chemistry Exam as they assist you with being comfortable with the sort of inquiries showing up in the test. DOC Chapter 14 - CHEMICAL EQUILIBRIUM 968) The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. 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. Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? C. 22.1 kJ mol-1 Provide your answer in units of coulombs (C). Understudies who are concentrating in CBSE, ICSE, IGCSE schools as well as different State Board schools. D. 12.79 India, (+ When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. (look up carbon dioxide phase diagram), Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? B. 358) \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is lower than the rate of the reverse reaction. C) 0.020 Bangladesh, (+ Science Chemistry For the following reaction, 2HI(g) --> H2(g) + I2(g) a. 5.99 torr New Zealand, (+ 07: Equilibrium / Chemistry Part-I - philoid.com Archived Questions & Answers - Page 1134 - Answer Happy 880) 46) [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. 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.
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