c. Which metal in the list is most reactive? 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. A. Xd + 2 H+ Xd2+ + 2 H2 D. CH3OH, D. CH3OH 27) 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. D) N2 (g) + 3H2 (g) 2NH3 (g) C. 12.28 Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. 2NH3 (g) N2 (g) + 3H2 (g) A. viscosity A. - A liquid can be converted to a gas by cooling. 27) What is the value of Keq for the following reaction? A2B(g) + B(g) A2B2(g) Kc = 16.4 0.183 Bangladesh, (+ B. hydrogen bonding Given: Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? How can I download the CBSE MCQs in PDF Format for free? Mexico, (+ Tap on the individual Chapter connection of twelfth Standard Chemistry you need to practice and profit the comparing points MCQ Quiz Questions. Belgium, (+ United Kingdom, (+ C) [H+][HCO3-] / [CO2][H2O] 230) E) shift the equilibrium to the right, D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture, Chemistry: Chapter 13 Review: Properties of S, CHAPTER 17: ADDITIONAL ASPECTS OF AQUEOUS EQU. +206 kJ PART A: D. 12.9 kJ D. 173 g C. remove reactant C. -16.0 kJ Q: What is the pH of a 0.240 M ammonia solution? is Keq = 230 at 300 C. E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? Key points. A) 2HI (g) H2 (g) + I2 (g) 41) 0.556 D) [SO3]2 / [SO2]2[O2]2 At equilibrium, ________. Guinea, (+ 380) 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) . If the value for K = 2.1 X10-2 at 730 K, which substance predominates, HI or H2 and I2 but the same value of Kc will be obtained at a given temperature. Consider the chemical equation and equilibrium constant at 25C: Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. 973) B. SiH4 44) Q: What is the mass of the silver block? B. D. TP and CP are always at the same pressure. \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) & \text { voltage }=-0.76 \mathrm{~V} A. To score well take a stab at rehearsing the rundown of Multiple Choice Type Questions gave in the connections underneath. - 1.92 x 103 kJ/mole Netherlands, (+ Assume excess SiO2. Q: What is the half-life for this reaction? Qc = 0.120 < Kc reaction proceeds to products. 2) Which one of the following is true concerning the Haber process? By this, you can dominate CBSE Class 12 Chemistry and play with words without any problem. Spain, (+ 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . It is the best methodology to chip away at the finished result. \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\ Netherlands, (+ Finland, (+ -2.16C Ukraine, (+ Bahrain, (+ D. Energy is neither created nor destroyed, excluding nuclear reactions. Mexico, (+ You will track down a rundown of Chapter wise MCQ Questions with Answers for CBSE Class 12 Chemistry here to start your planning. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.] C) addition of some to the reaction vessel (V and T constant) Two liquids, labeled A and B, form an ideal mixture with total vapor pressure P = 324.4 torr at a certain composition. B) reactants predominate is Keq = 4.34 10-3 at 300 C. 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) Q does not change with temperature. D. Intermolecular forces. Q: Which acid is stronger? E. In equilibrium, the ratio [P] / [A] is equal to k / k'. B) 0.50 A. What is the standard free energy change (Grxn) for this reaction? Cambodia, (+ 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. B. B) It is a process used for the synthesis of ammonia. The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. 880) After equilibrium was reached, the partial pressure of NO dropped to 320 torr. H2 (g) + I2 (g) <------------------> 2 HI (g) N2(g)+O2(g)+Br2(g)2NOBr(g). 995) 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. Belgium, (+ +25.5 kJ Spain, (+ 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. After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. 233) H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 355) D) [CO2][H2O] / [H+][HCO3-] 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. Understudies who are getting ready for designing and clinical selection tests like NEET, IIT JEE, AIIMS, JIPMER and SAT Exams in Chemistry. Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. Q3. Portugal, (+ A closed vessel at 400 K is charged with 1.00 atm of Br2 (g), 1.00 atm of Cl2 (g), and 2.00 atm of BrCl (g). Determine the cell notation for the redox reaction given below. 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. 351) C. Neither direction is favored. A) [H+][HCO3-] / [CO2] D. 40.5C Understudies who are concentrating in CBSE, ICSE, IGCSE schools as well as different State Board schools. B) increase the partial pressure of CO2 (g) D. 5.50 10-14 Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. Each question has four options followed by the right answer. 2SO2 (g) + O2 (g) 2SO3 (g) is Kp = 7.0. 380) B. From Midterm 3: Pakistan, (+ Enter the email address you signed up with and we'll email you a reset link. What is the mole fraction xA of liquid A in this mixture. 351) E. There is not enough information to calculate the Kw. A) 25 What is the value of Keq at this temperature for the following reaction? O=O 498 Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. Switzerland, (+ Part A: Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. D. 0.420 United States, (+ Which statement applies to the equilibrium of this reaction after the pressure is changed to 2 bar, but with the temperature remaining at 30C ? How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? 33) CH3NC(g) CH3CN(g) corresponds to which redox cell reaction ? HC2H3O2 1.8105] 33) 37.5 g 48) A) at high temperature and high pressure [Seriously? E) The reaction will go to completion since there are equal amounts of Br2 and Cl2. B. What is the primary source of water stored in an aquifer? The reaction : N 2O4 2N O2 J & K CET 2018 8. B) the rates of the forward and reverse reactions are equal. The reaction mixture will contain [A]=0.1M and [B]=1.0M. 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. D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. [A redox reaction has an Ecell=1.00V] 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. Albania, (+ A. Understudies who are planning for serious assessments like NTSE, Olympiad, and so forth for class 12. New Zealand, (+ What happens to the vapor pressure of a substance when the temperature is increased? Bond Bond Energy (kJ/mol) A. Bangladesh, (+ For benzoic acid, Ka=6.5105. In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. Which statement is true of an endothermic reaction? D) only products are present E) only reactants are present, 22) The equilibrium constant for the gas phase reaction Albania, (+ Determine the partial pressure of each gas at equilibrium. Which of the following substances would you predict to have the highest Hvap? SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) Hrxn = -184 kJ From Midterm 3: 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . All the Solutions are explained in a comprehensive manner and are recommended by many subject experts. Determine the value of the missing equilibrium constant. - A gas can be converted into a liquid by heating. 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. See Answer. B. D. If the temperature is raised, then the reverse reaction is favored. Swaziland, (+ Hrxn = ? C) The equilibrium partial pressure of Br2 will be greater than 1.00 atm. In a particular experiment, the partial pressures of H 2 and I 2 B) [CO2] / [H+][HCO3-] Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. (iii) The total pressure increases as the system approaches equilibrium. 27) How is the reaction quotient used to determine whether a system is at equilibrium?
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