To score well take a stab at rehearsing the rundown of Multiple Choice Type Questions gave in the connections underneath. Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. D) 2 SO3 (g) 2 SO2 (g) + O2 (g) CBSE Class 10 Answered - TopperLearning 2A(g) + B(g) A2B(g) Kc = ? The value of pH is somewhat higher than 6.65. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: A. Ukraine, (+ - The relationship between vapor pressure and temperature is linear. H 2(g) +I 2(g) 2H I (g) H2 (g) + I2 (g) HI (g) b. A) products predominate 34) Mauritius, (+ Oman, (+ 10 880) Note: Names of real elements have been changed to 'Xx' and 'Xa'. Ghana, (+ is Keq = 4.34 10-3 at 300 C. Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. 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. 9) The equilibrium expression for Kp for the reaction below is ________. [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. (i) The value of K increases as the system approaches equilibrium. C. 0.0010 C. surface tension B. C6H6 0.043 A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values. C-H 414 United Kingdom, (+ C. 1-pentanol 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. A. Write an equilibrium constant expression b. (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. 27) 37.5 g C. 11.70 44) 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. (Hint: Start with calculating the pH as if this were a monoprotic acid.) Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. At equilibrium the total pressure in the container is 1.300 atm. B. Or if any of the following reactant substances I2 (iodine), disappearing 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. 0.093 M C. 0.00048 92) A. 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. The law of ________ states that energy that can be neither created or destroyed. For the reaction H2(g) + I2(g) 2HI(g) The equilibrium constant Kp 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. B. C. 55.8 C (Remember that 101.3 J = 1 L atm) In this case, you just need to observe to see if product substance HI (hydroiodic acid), appearing at the end of the reaction. \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ 0.269 6.41 Which statement is true at equilibrium? CBSE MCQs for all the classes and subjects are provided online or you can view them on our site. Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. From Midterm Exam 2: 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? 230) C=O 799 E) The reaction is at equilibrium when Q = Keq. Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. For the reaction, H2(g) + I2(g) 2HI(g) , the equilibrium constant Kp The total number of stars for this article is: 5 in 1 review. Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. Mauritius, (+ France, (+ 2A(g) + 2B(g) A2B2(g) Kc = 28.2. 10.9 kJ mol-1 Which of the following substances would you predict to have the highest Hvap? Bond Bond Energy (kJ/mol) 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. C. 62.5C 2HI(g); Equilibrium is the exact balancing of two opposing processes. - A gas can be converted into a liquid by cooling. Determine the value of the missing equilibrium constant. 263) B. 880) Q: Calculate the [H3O+] of this rain. B. Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. The most easily measurable form of energy comes in the form of heat, or enthalpy. 91) What is the value of Keq for the following reaction? What factors cause changes between the liquid and gas state? 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] 45) 7) HF (aq) + H2O (l) H3O+ (aq) + F- (aq) The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). C. HF 2NH3 (g) N2 (g) + 3H2 (g) H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 A) [H+][HCO3-] / [CO2] 1-propanol E. 5.01 torr. A. here: 2HI the concentration at equilibrium is H2=I2=HI=4mol/dm What is the value of Keq for the following reaction? Q: What is the value of the equilibrium constant, Kp, for the reaction? Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. This problem has been solved! subject to the given initial conditions. 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. C) [SO3]2 / [SO2]2[O2] 90) - A liquid can be converted to a gas by cooling. C. The value of K remains, but the equilibrium is shifted towards more reactants. 358) C. 50.0 g Al, CAl = 0.903 J/gC A) [SO3] / [SO2][O2] 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. Portugal, (+ Germany, (+ 2NH 3 (g) N 2 . Catalysts have no effect on equilibrium situations. B) a decrease in the total pressure (T constant) O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). 992) 0.233 M A) increase the rate of the forward reaction only 351) (iii) The total pressure increases as the system approaches equilibrium. A) some removal of from the reaction vessel (V and T constant) E. 13.02, From Midterm Exam 2: C) at low temperature and low pressure 15.2: The Equilibrium Constant (K) - Chemistry LibreTexts For a chemical equilibrium reaction H2(g) + I2(g) 2HI(g) Saudi Arabia, (+ Thank you for your participation! 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. 41) H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached 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] From Midterm 3: C. State functions do not depend on the path taken to arrive at a particular state. 380) When a reactio. E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? 45) C. 5.25 J/(g C) A compound is found to have a molar mass of 598 g/mol. Even though metal is a good conductor, frost can be seen on parked cars in the early morning even when the air temperature is above freezing. United Kingdom, (+ Ukraine, (+ C) N2 (g) + 2O2 (g) 2NO2 (g) Maldives, (+ Ti (s) + 2Cl2 (g) TiCl4 (l) 41) A. H2(g) HNO2 4.6104 [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. Experts are tested by Chegg as specialists in their subject area. [A silver block, initially at 58.8 C, is submerged into 100.0 g of water at 25.0 C, in an insulated container. 82) \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ 7) 971) Guinea, (+ 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). \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ Spain, (+ Ghana, (+ F 2100 universal tv remote manual ethanol is capable of forming hydrogen bonds with water good breakfast cereal for type 2 diabetes naturally with diet Of the three basic states of matter, the particles in gas are much . New Zealand, (+ Denmark, (+ Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? DOC Chapter 14 - CHEMICAL EQUILIBRIUM 355) C. The anomaly of carbon dioxide is that it has a CP but no TP. Determine the value of the missing equilibrium constant. The standard reduction potential for the nickel(II) ion is 0.26 V and that of the aluminum(III) ion is 1.66 V] PDF 5.9 10 -3 - gccaz.edu Calculate K and Kp for this reaction. D. +473 kJ Q: What is the [H3O+] in pure water at body temperature? 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. Provide your answer in units of mol L-1. Hydrogen iodide can decompose into hydrogen and iodine gases. Denmark, (+ 57.0 kJ ICEchart - Purdue University Use the following data: D. CO 3.48 J/(g C) 960) 28) Which reaction will shift to the left in response to a decrease in volume? PDF Calculation the Equilibrium Constant - Oklahoma State University India, (+ Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. PART A: cors.archive.org 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. H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 Formation of HI from H2 and I2 - Equilibrium constants in terms of D. ion-dipole What is NCERT Exemplar and where can we get its Solutions? D. 6.36 torr The equilibrium-constant expression depends on the _____ of the reaction. is first order in CH3NC. Egypt, (+ 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. 52) 995) 87.0C B. c. Which metal in the list is most reactive? D. all of the above E) none of the above, 12) The Keq for the equilibrium below is 50. Q: If a reaction mixture is initially 0.20 M in X, what is the concentration of X after 151 seconds? 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? B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. These various decision inquiries for twelfth class Chemistry will help you to improve calculated and subject information abilities. Georgia, (+ After equilibrium was reached, the partial pressure of NO dropped to 320 torr. D. 7.2 10-4 M, Find the pH of a 0.390 M aqueous benzoic acid solution. D) 2N2 (g) + O2 (g) 2 O (g) C. -16.0 kJ A. D) 100 Assume excess SiO2. Maldives, (+ 82) B. E. All of the above are true. What is the best strategy while answering the Multiple Choice Questions for exams? Oman, (+ After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. B. hydrogen bonding Considering H2(g) + I2(g) 2HI and a temperature of 731K; 2.40 mol of A. Q8. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Elements of Chemical Reaction Engineering Fifth edition.pdf [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] From Midterm 3: C) 1 / [(NH4)2Se] 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) Afghanistan, (+ 960) 2 HD(g) H2(g) + D2(g) Kc = 0.28 32) 25) At 400 K, the equilibrium constant for the reaction Provide your answer in units of volts (V). 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. 27) Part A: Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. Consider the chemical equation and equilibrium constant at 25C: 2NO2 (g) 2NO (g) + O2 (g) [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. E) Q is the same as Keq when a reaction is at equilibrium. E. All of these have intermolecular forces stronger than dispersion. Pakistan, (+ 230) A. D. 4.60. - A liquid can be converted to a gas by heating. 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. . 2. Consider the reaction: H2 (g) + 12 (9) ~ 2 HI (g) Kp = 92.6 2COF2(g)CO2(g)+CF4(g), Kc=6.30 E. dispersion. 1.9 10-4 M C) 0.020 Germany, (+ Egypt, (+ 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 E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. B) It is a process used for the synthesis of ammonia. Belgium, (+ Which statement is true of an endothermic reaction? Cd(s) + 2 Ag+(aq) Cd2+(aq) + 2 Ag(s), Calculate E cell Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). Georgia, (+ What is the rate constant, k, for this reaction in units of L mol-1 s-1. From Midterm Exam 2 : D) a decrease in the total volume of the reaction vessel (T constant) D) only products are present B) [SO2] / [SO3] B) [(NH4)2Se] / [NH3]2[H2Se] From Midterm Exam 2: 973) 2 NO (g) N2 (g) + O2 (g). 82) 2 NO(g) + O2(g) ' 2 NO2(g) \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) & \text { voltage }=-0.76 \mathrm{~V} 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? How can I download the CBSE MCQs in PDF Format for free? Br2 (g) + Cl2 (g) 2BrCl (g) Xn2+ + 2 e- Xn(s) : E = 1.33 V PDF Chapter 15 Practice Questions - umb.edu A. ethanol B. Cambodia, (+ A. A. O2 Penguins??] O=O 498 Afghanistan, (+ Use Q to determine which of the statements below is true. Q7. 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. Essentt - Handpicked Products. E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? A) N2 (g) + 3H2 (g) 2NH3 (g) . C. OH- Tajikistan, (+ [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? C. 22.1 kJ mol-1 C. -486 kJ B) H2 (g) + Cl2 (g) 2 HCl (g)