C) N2 (g) + 2O2 (g) 2NO2 (g) 2.65 To score well take a stab at rehearsing the rundown of Multiple Choice Type Questions gave in the connections underneath. C) N2 (g) + 3H2 (g) 2 NH3 (g) A. BF3 At 100 C and 1 atm, water is in which phase? E) The reaction will go to completion since there are equal amounts of Br2 and Cl2. A. Sweden, (+ 0.81 Guinea, (+ 4CuO (s) + CH4 (g) CO2 (g) + 4Cu (s) + 2H2O (g), 20) The equilibrium-constant expression for the reaction Consider the chemical equation and equilibrium constant at 25C: 9) The equilibrium expression for Kp for the reaction below is ________. The most easily measurable form of energy comes in the form of heat, or enthalpy. Compute the pH at 25C after 3 mL of the base has been added. D) 1.90 1019 A. A P 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? You'll get a detailed solution from a subject matter expert that helps you learn core concepts. A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. A) [NH3][H2Se] / [(NH4)2Se] What factors cause changes between the liquid and gas state? H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? is Keq = 230 at 300 C. [Like all equilibrium constants, the value of Kw depends on temperature. - 1.92 x 103 kJ/mole C. The reaction mixture will contain equal concentrations of A and B. A) N2 (g) + 3H2 (g) 2NH3 (g) 2 NO (g) N2 (g) + O2 (g). Bond Bond Energy (kJ/mol) B) H2 (g) + Cl2 (g) 2 HCl (g) Q: Calculate the molality of the solution. C. +873 J mol-1 Rating: 5 / 5 stars. How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? +206 kJ Q: What is the value of the equilibrium constant, Kp, for the reaction? At equilibrium, ________. Egypt, (+ In this case, you just need to observe to see if product substance HI (hydroiodic acid), appearing at the end of the reaction. United Kingdom, (+ 2 Xs(s) + 3 Xn2+(aq) 2 Xs3+(aq) + 3 Xn(s) . A. The equilibrium constant K p is independent of (A) Total pressure (B) Catalyst (C) The amounts of H 2 and I 2 present However, it changes with Temperature XaO4-(aq) + 4 H+(aq) + 3 e-(aq) XaO2(s) + 2 H2O(l) . Ghana, (+ D. +653 J mol-1 D) only products are present 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . 2 NO(g) + O2(g) ' 2 NO2(g) - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Experts are tested by Chegg as specialists in their subject area. South Korea, (+ India, (+ 52) Georgia, (+ H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 The NCERT Solutions for the questions are present on our site or you can find them online too. D) increase the value of the equilibrium constant 234) What is the best strategy while answering the Multiple Choice Questions for exams? B. SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) Hrxn = -184 kJ A. increase product Poland, (+ From Midterm 3: Switzerland, (+ Ukraine, (+ 2 HD(g) H2(g) + D2(g) Kc = 0.28 (i) The value of K increases as the system approaches equilibrium. 3) Which one of the following will change the value of an equilibrium constant? E. 8.89. D. 1, The equilibrium constant is given for two of the reactions below. 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? 977) Maldives, (+ Pakistan, (+ 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: 0.21 M B. B. 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. What is the value of Keq at this temperature for the following reaction? B. D) only products are present For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction Utilizing the assets accessible you can score well in the test. 37.5 g 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). Guinea, (+ The heat capacity of the calorimeter is 4.90 kJ/C. Given: D. capillary action 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ Or if any of the following reactant substances I2 (iodine), disappearing Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? Let's flip the above reaction. 2A(g) + B(g) A2B(g) Kc = ? Oman, (+ B. density D) [NH3]2[H2Se] Georgia, (+ Switzerland, (+ (Methanol ( CH3OH ) contains hydrogen directly bonded to oxygen, so it has hydrogen bonding. From Midterm Exam 2: These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. Finland, (+ 1.9 10-4 M Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? A) [SO3] / [SO2][O2] E. 0.169 M, From Midterm Exam 2: B) [SO2] / [SO3] 3.48 J/(g C) From Midterm 3: Nigeria, (+ A. Covalent bond forces N2 (g) + 3H2 (g) 2NH3 (g) D. CO 64) 4) Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? 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? [Acid rain over the Great Lakes has a pH of about 4.6.] Albania, (+ If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium? 8.36 torr All reactant and product concentrations are constant at equilibrium. Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. A -253 B. 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] B. CP is always at a higher temperature relative to TP. Sweden, (+ A. Xd + 2 H+ Xd2+ + 2 H2 From Midterm 3: He(g) Guinea, (+ Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. B. 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. Provide your answer in units of volts (V). Test your critical thinking abilities by noting the Chemistry Multiple Choice Questions with Answers for Class 12 PDF all alone. For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . Maldives, (+ Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? C. 150 g Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. D -511. 90) D. 12.79 From Midterm Exam 2: C. 55.8 C B) N2O4 (g) 2NO2 (g) New Zealand, (+ 995) Understudies who are planning for serious assessments like NTSE, Olympiad, and so forth for class 12. 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) . A) The reaction quotient must be satisfied for equilibrium to be achieved. 960) B) a decrease in the total pressure (T constant) The reaction : N 2O4 2N O2 J & K CET 2018 8. A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. 48) An aqueous solution contains 0.10M H 2S and 0.20M H Cl . Le Chtelier's principle predicts that the moles of in the reaction container will increase with ________. - A liquid can be converted to a gas by cooling. 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] Weak bonds break and strong bonds form. B. A. O2 Oman, (+ D. At any time, the ratio [P] / [A] is equal to k' / k. is Keq = 4.34 10-3 at 300 C. What is the mole fraction xA of liquid A in this mixture. B) Keq does not change with temperature, whereas Q is temperature dependent. PART A: D. 1.2 It can be represented as. If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. 32) Provide an explanation. For these conditions, what is the value of Kp for the reaction that occurred: France, (+ E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Cambodia, (+ Q3. Hungary, (+ A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. 2003-2023 Chegg Inc. All rights reserved. Note: Names of real elements have been changed to 'Xd'. What is the need of NCERT Solutions and CBSE MCQs? A. Albania, (+ India, (+ 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)? Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. United States, (+ N2(g)+O2(g)+Br2(g)2NOBr(g). -69.8 J mol-1 Consider the following reactions and their respective equilibrium constants: A. Note: Names of real elements have been changed to 'Xx' and 'Xa'. Mexico, (+ C. 2.8 10-5 M 93) B. B. B. +238 kJ C. Ionic bond forces The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. Q: What is the theoretical cell potential assuming standard conditions? Donald A. McQuarrie, Ethan B Gallogly, Peter A Rock, Edward Atkins, Julio de Paula, Peter Atkins. 0.556 After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. B) H2 (g) + Cl2 (g) 2 HCl (g) 45) The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. 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] Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). E) only reactants are present, 23) The equilibrium constant for the gas phase reaction is Kp = 7.0. B. SiH4 C 185 [The decomposition of SO2Cl2SO2Cl2 is first order in SO2Cl2SO2Cl2 and has a rate constant of 1.46104 s1s1 at a certain temperature] Thank you for your participation! E. 13.02, From Midterm Exam 2: 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. (iii) The total pressure increases as the system approaches equilibrium. The reaction mixture will contain [A]=1.0M and [B]=0.1M. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. 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 ? Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. M. What is the half-life, t1/2, for this reaction in units of seconds ? Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? 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. H2 + I2 = 2 HI Since there is an equal number of each element in the reactants and products of H2 + I2 = 2HI, the equation is balanced. 27) Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. C. N2 B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. 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. (look up phase diagram). [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] A. The gases react to form l-l] according to the equation above. Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. B) [(NH4)2Se] / [NH3]2[H2Se] 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. South Africa, (+ Part A: What is the value of E for the combustion of the fuel? 855) Tap on the individual Chapter connection of twelfth Standard Chemistry you need to practice and profit the comparing points MCQ Quiz Questions. 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. 230) A. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. D. 0.087 CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions. [A silver block, initially at 58.8 C, is submerged into 100.0 g of water at 25.0 C, in an insulated container. E. The reverse reaction is favored. By using Laplace transforms, solve the following differential equations B. 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) 2.34 10-7 A(g) + 2B(g) AB2(g) Kc = 59 B. E. All of these have intermolecular forces stronger than dispersion. H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. A) 2HI (g) H2 (g) + I2 (g) 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. Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. The rate constant for the reaction is 9.45 10-5 s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s. From Midterm 3: Give the direction of the reaction, if K >> 1. [The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK] C. 1.28 What is dynamic equilibrium? CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. Two liquids, labeled A and B, form an ideal mixture with total vapor pressure P = 324.4 torr at a certain composition. Enter the email address you signed up with and we'll email you a reset link. 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. Xs3+ + 3 e- Xs(s) : E = -0.55 V B. 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. 34) with forward (A P) rate constant k and reverse (A P) rate constant k' is correct? United Kingdom, (+ D. The value of K remains, but the equilibrium is shifted towards more products. E. CP is always at a lower temperature relative to TP. A. adding SO3 B. Intramolecular forces By clicking Agree & join, you agree to the Study24x7 41) 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. United States, (+ E. +4087 J mol-1, From Midterm Exam 2: Equilibrium constant expression in terms of partial pressures Portugal, (+ [Seriously? [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] E. 5.01 torr. 50.0 g Cu, CCu = 0.385 J/gC 960) -2.16C Pakistan, (+ Determine the value of the missing equilibrium constant. C-O 360 Calculate the change in pH after 15 mL of a 0.4 M solution of a strong base had been added to 100 mL of this buffer. system remains constant during its change from Examples:- (i) H2(g) + I2(g) 2HI(g) the initial to final state. C. Xd2+ + 2 H+ Xd + H2 Check all that apply. 31) E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. 2.30 A. The reaction mixture will contain [A]=0.1M and [B]=1.0M. 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 = 0.31 233) Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. 355) C) [SO3]2 / [SO2]2[O2] C) K does not depend on the concentrations or partial pressures of reaction components.