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2 NO(g) + O2(g) ' 2 NO2(g) Which of the following is NOT a conjugate acid-base pair? 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? 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) 233) Cambodia, (+ To calculate Kp, you first need to know the partial pressures of each gas in a mixture, then you simply put the partial pressure values into the equation you worked out earlier. C) N2 (g) + 3H2 (g) 2 NH3 (g) Part A: Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. A. Solved Hydrogen iodide undergoes decomposition according to - Chegg Russia, (+ where n represents the stoichiometric coefficients] Denmark, (+ So, visit our site and easily find MCQs for all subjects classwise. What is the value of Keq at this temperature for the following reaction? Guinea, (+ It changes only with changes in temperature of the system. Zimbabwe, (+ +1251 J mol-1 Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. 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] 2HI = H2 + I2 | Chemical Equation. C. 1-pentanol B) 1.56 104 Finland, (+ 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: at a certain temperature. What is the stoichiometric coefficient of Xx(s) in the balanced reaction equation for that cell ? Kc depends on how the chemical equation is written, but not on how the reaction is carried out. 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ Chemical Kinetics Questions and Answers | Homework.Study.com 46) New Zealand, (+ 351) From Midterm 3: Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. D -511. C. +115 kJ C) K does not depend on the concentrations or partial pressures of reaction components. A. Each question has four options followed by the right answer. 90) D. 0.117 M 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. At body temperature (37C), Kw=2.41014] 0.13 M C. 4.3 M D. 0.039 M Calculate Hrxn for the following reaction: A) products predominate Elements of Chemical Reaction Engineering Fifth edition.pdf Which change will shift the equilibrium to the left? Q2. D) The reaction is at equilibrium when Q > Keq. Mexico, (+ 82) 968) 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. 380) 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] Afghanistan, (+ Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. C. 0.0010 Bahrain, (+ D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture (NH4)2Se (s) 2NH3 (g) + H2Se (g) At equilibrium the total pressure in the container is 1.300 atm. 0.043 0.233 M D. C2H3O2-/HC2H3O2 B. Half-reaction reaction potentials you might need are: A. C. The reaction mixture will contain equal concentrations of A and B. 2 NO (g) N2 (g) + O2 (g). 2 SO2(g) + O2(g) 2 SO3(g) Answer Substance Hf (kJ/mol) 52) Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. [Acid rain over the Great Lakes has a pH of about 4.6.] 4CuO (s) + CH4 (g) CO2 (g) + 4Cu (s) + 2H2O (g), 20) The equilibrium-constant expression for the reaction B -423 Determine the value of the missing equilibrium constant. A. BF3 The law of ________ states that energy that can be neither created or destroyed. A. The reaction mixture will contain [A]=0.1M and [B]=1.0M. A. (look up carbon dioxide phase diagram), Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? Q: What is the pH of a 0.240 M ammonia solution? A. Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. A) N2O4 (g) 2NO2 (g) 880) E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? 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. D) [CO2][H2O] / [H+][HCO3-] . Ukraine, (+ 968) 12.30 \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ Denmark, (+ h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. By clicking Agree & join, you agree to the Study24x7 C. HF Germany, (+ E. The value of pH is 2.13. Zimbabwe, (+ Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. B) at high temperature and low pressure Top 2 posts Page 1 of 1 E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Xd(s) | Xd2+(aq) || H+(aq) | H2(g) | Pt . 2. Consider the reaction: H2 (g) + 12 (9) ~ 2 HI (g) Kp = 92.6 Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. D. all of the above 348) 31) A) decrease the partial pressure of O2 (g) For the equilibrium of the dissociation reaction of the compound 'A2', the concentrations were found to be [A2] = 0.022 M and [A] = 0.13 M at 25C: 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. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. 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. A. C. The bonds that break and those that form are of approximately the same strength. The equilibrium constant for the reaction H2+I2<->2HI is 54.8 at 425 You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. A P B. B. C=O 799 For the reaction H2(g) + I2(g) 2HI(g) The equilibrium constant Kp CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. 355) H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 South Korea, (+ D. 5.11 [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. D. +653 J mol-1 - A gas can be converted into a liquid by cooling. A. H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant C. 50.0 g Al, CAl = 0.903 J/gC What state transition or transistions occur in carbon dioxide if you begin with a sample of carbon dioxide at 60.0 C at 50.0 atm and warm the sample to 10.0 C and 50.0 atm? Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. 11.90 B. K=0 You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. 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. - A gas can be converted into a liquid by cooling. What is NCERT Exemplar and where can we get its Solutions? Write an equilibrium constant expression b. C. H3O+/OH- - A liquid can be converted to a gas by heating. Consider the first-order decomposition of compound A according to From Midterm 3: Consider the following reactions and their respective equilibrium constants: B. A. Belgium, (+ Q: What is the theoretical cell potential assuming standard conditions? A) N2 (g) + 3H2 (g) 2NH3 (g) D) 100 Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. After the reaction reaches equilibrium, the total pressure is 2.65 atm.] 90) 4) Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? A. Covalent bond forces There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. 1.72 3) Which one of the following will change the value of an equilibrium constant? Determine the partial pressure of each gas at equilibrium. C) roughly equal amounts of products and reactants are present NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. Note: Names of real elements have been changed to 'Xx' and 'Xa'. Answered: The statements in the tables below are | bartleby Thank you for your participation! A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. It will assist you with knowing regardless of whether your arrangement is continuing the correct way. Rehearsing NCERT Online Chemistry Objective Questions For Class 12 Pdf Answers is perhaps the most ideal way to plan for the CBSE Class 12 board test. A. PPT PowerPoint Presentation User Agreement,Privacy Policy Tajikistan, (+ Ukraine, (+ New Zealand, (+ Xn2+ + 2 e- Xn(s) : E = 1.33 V Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? B. M. What is the half-life, t1/2, for this reaction in units of seconds ? A. ethanol The statements in the tables below are about two different chemical equilibria. E) Q is the same as Keq when a reaction is at equilibrium. Formation of HI from H2 and I2 - Equilibrium constants in terms of D) at low temperature and high pressure There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. Determine the cell notation for the redox reaction given below. 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 C. The value of pH is 6.65. 34) 64) 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 D. At any time, the ratio [P] / [A] is equal to k' / k. 268) C. N(g) 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. Afghanistan, (+ C) 5.4 1013 93) B) 2500 Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: Determine the value of . 855) A. Erxn can be determined using constant volume calorimetry. C. 0.037 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. E. increase pressure, The following reaction is exothermic. 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. H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . A) some removal of from the reaction vessel (V and T constant) A) products predominate What is the need of NCERT Solutions and CBSE MCQs? D. CO Experts are tested by Chegg as specialists in their subject area. 3. 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 . Georgia, (+ (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. Science Chemistry For the following reaction, 2HI(g) --> H2(g) + I2(g) a. The isomerization of methylisonitrile to acetonitrile C) slow the reverse reaction only Ghana, (+ India, (+ A. PO43- C) 0.020 48) Q3. 7) D. -150. kJ H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? 26) Which of the following statements is true? B. From Midterm 3: Weak bonds break and strong bonds form. Denmark, (+ 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. 973) Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. (look up phase diagram). Sweden, (+ E. All of the above are true. 6) The equilibrium-constant expression depends on the ________ of the reaction. Which metal ion in the list is most difficult to reduce? 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. The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . 100.0C C. 0.222 A 250 mL sealed flask contains 0.65 g of butane at 22C.] B. Calculating equilibrium constant Kp using partial pressures - Khan Academy C. State functions do not depend on the path taken to arrive at a particular state. 2 HBr(g) H2(g) + Br2(g) Kc = ? Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. Provide an explanation. The reaction mixture will contain [A]=0.1M and [B]=1.0M. 977) 107 g 1) C. Ionic bond forces 8.36 torr (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. Belgium, (+ B. NaCl 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. Netherlands, (+ is Keq = 230 at 300 C. Sweden, (+ Use the following data: It is the best methodology to chip away at the finished result. B) Keq does not change with temperature, whereas Q is temperature dependent. 0.81 The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: C) [H+][HCO3-] / [CO2][H2O] A. [An aqueous solution contains 32% HCl by mass] B) H2 (g) + Cl2 (g) 2 HCl (g) Another example of a chemical equation that can be used to explain is given below: Equation: 2 S O 2 ( g) + O 2 ( g) 2 S O 3 ( g) Equilibrium Constant: K C = [ S O 3] 2 [ S O 2] 2 [ O 2] Moreover, in terms of finding equilibrium constant for gases, partial pressure is taken into account. United States, (+ Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. D. 1.2 Polyoxometalate Molecular Science [PDF] [534rrp5c23v0] [Suppose that 1.10 g of rubbing alcohol (C3H8O)] C. -486 kJ [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. D) only products are present B) reactants predominate Find the equilibrium amounts of these compounds if they all start out at 0.120 M. Solution: Determine Qc so that you know which direction the reaction will proceed. Initially, the vessel contains only X2 at a pressure of 1.75 atm. (iii) The total pressure increases as the system approaches equilibrium. E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? Use the following reactions and given H values. 2NH3 (g) N2 (g) + 3H2 (g) 7154 1.14 J/(g C) For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction C. CF4 Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. 973) 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. Provide your answer in units of coulombs (C). E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. 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 gas can be converted into a liquid by increasing the pressure of a gas sample. B) 1 / [HF] 28.4 kJ B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. 2.65 [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] C. The value of K remains, but the equilibrium is shifted towards more reactants. D. The value of pH is somewhat lower than 2.13. Determine the value of the missing equilibrium constant. A. H 2(g) +I 2(g) 2H I (g) A) the quantities of reactants and . For a chemical equilibrium reaction H2 (g) + I2 (g) 2HI(g) write an expression for Kp (and relate it to Kc). E. In equilibrium, the ratio [P] / [A] is equal to k / k'. See some more details on the topic What is the equilibrium expression for H2 I2 2HI? E. 0.158. All reactant and product concentrations are constant at equilibrium. Calculate the equilibrium constant for the following reaction at 25C: D. 32.2 kJ mol-1 Saudi Arabia, (+ Part B: What is the value of H for the combustion of the fuel? Germany, (+ B. 2SO2 (g) + O2 (g) 2SO3 (g) 64) Equilibrium constant expression in terms of partial pressures Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. D) [H3O+][F-] / [HF] Understudies who are concentrating in CBSE, ICSE, IGCSE schools as well as different State Board schools. The equilibrium constant K (article) | Khan Academy 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. B. D) 2HI (g) H2 (g) + I2 (g) At equilibrium, ________. A) [H+][HCO3-] / [CO2] Pakistan, (+ E. The equilibrium constant K as well as [A] and [A2] are unchanged.