United Kingdom, (+ 100.0C SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) Hrxn = -184 kJ A. Oman, (+ 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. H2(g) + Br2(g) 2 HBr(g) Kc = 3.8 104 A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values. Enter the email address you signed up with and we'll email you a reset link. A) 5.26 10-20 A. F2 C. +115 kJ 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. +25.5 kJ C. 5.25 J/(g C) A 250 mL sealed flask contains 0.65 g of butane at 22C.] 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. 82) Determine the value of the missing equilibrium constant. B) 1.9 10-14 9.64 C. +873 J mol-1 Le Chtelier's principle predicts that a decrease in temperature will ________. D. 39.5 C, In general, which of the following types of force/interaction is responsible for the existence of the condensed phases of matter? C. 0.222 H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . A) 25 2 NO(g) + O2(g) ' 2 NO2(g) C) 7.07 268) -4.56C E. 8.89. is first order in CH3NC. Energy can be transferred in many ways, one of which is in the form of work. 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. C. CF4 The equation for the dissociation of hypochlorous acid is: Business, Finance, Economics, Accounting, Operations Management, Computer Science, Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical . [Nickel and aluminum electrodes are used to build a galvanic cell. A) 2HI (g) H2 (g) + I2 (g) Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. 973) [The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK] C. 12.54 Download the Study24x7 App, so you can connect and collaborate. 25) At 400 K, the equilibrium constant for the reaction Experts are tested by Chegg as specialists in their subject area. Q: What is the mole fraction of hexane? Poland, (+ 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. 977) H2 (g) + I2 (g) HI (g) 2SO2 (g) + O2 (g) 2SO3 (g) (i) The value of K increases as the system approaches equilibrium. +206 kJ 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)? A) 5.4 10-13 D) only products are present E. 1.62. C. Neither direction is favored. Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. Russia, (+ [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] The equilibrium-constant expression depends on the _____ of the reaction. When the equilibrium constant is written with the gases in terms of partial pressure, the equilibrium constant is written as the symbol K_\text p K p. The subscript p stands for penguins. Determine the pH value at 25C for a 0.062 M solution of a base that is 100% dissociated. Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. E. 0.371, From Midterm Exam 2: H2(g)+I2(g)2HI(g) , K=6.2102 Germany, (+ D. 1.85 Weak bonds break and strong bonds form. PART B: C. The bonds that break and those that form are of approximately the same strength. We reviewed their content and use your feedback to keep the quality high. C. -486 kJ AB2(g) + B(g) AB3(g) Kc = ? [Acid rain over the Great Lakes has a pH of about 4.6.] Afghanistan, (+ D. 12.9 kJ 2 SO2(g) + O2(g) 2 SO3(g) 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. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? 268) 973) Afghanistan, (+ Saudi Arabia, (+ 93) E) -50, 13) The Keq for the equilibrium below is 50. CH4(g)+Cl2(g)CH3Cl(g)+HCl(g), H=99.60 kJ B) at high temperature and low pressure HC2H3O2 1.8105] D) [SO3]2 / [SO2]2[O2]2 Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? 31) C. 0.0010 Consider the chemical equation and equilibrium constant at 25C: H2 (g)+I2 (g)2HI (g) , K=6.2102 Calculate the equilibrium constant for the following reaction at 25C: HI (g)12H2 (g)+12I2 (g) C. 11.70 - The vapor pressure of a liquid increases with increasing temperature. B. 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. If the temperature is raised, then the forward reaction is favored. Q: How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration? D) Q does not depend on the concentrations or partial pressures of reaction components. Albania, (+ C. N(g) If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . - A liquid can be converted to a gas by heating. Q8. France, (+ D. 456 kJ A. Each question has four options followed by the right answer. C. 2.13 10-14 D) only products are present Let's flip the above reaction. E. 0.169 M, From Midterm Exam 2: 46) 971) - The vapor pressure of a liquid decreases with increasing temperature. 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. By clicking Agree & join, you agree to the Study24x7 B. Calculate the equilibrium constant for the following reaction at 25C: corresponds to which redox cell reaction ? Catalysts have no effect on equilibrium situations. 355) 27.3 kJ mol-1 CH3Cl(g)+Cl2(g)CH2Cl2(g)+HCl(g), H=105.8 kJ, Use the standard reaction enthalpies given below to determine Hrxn for the following reaction: D. Xd + H+ Xd2+ + H2 + Pt Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. 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. 2 HBr(g) H2(g) + Br2(g) Kc = ? The pH of a solution of boric acid, H3BO3(aq), with Ka = 5.410-10 has been found to have a value of 5.02. Xd(s) | Xd2+(aq) || H+(aq) | H2(g) | Pt Guinea, (+ B. 224) This multitude of MCQs with answers are delivered by subject specialists for a wide range of understudies. D. The value of pH is somewhat lower than 2.13. 46) h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. Provide an explanation. B. 380) 41) Cambodia, (+ 2NO(g)N2(g)+O2(g)Kp=2.11030 48) C) The equilibrium partial pressure of Br2 will be greater than 1.00 atm. 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. - A gas can be converted into a liquid by cooling. D. 173 g O=O 498 B. Xd + 2 H+ 2 Xd+ + H2 C. The value of pH is 6.65. B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. . Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. 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] Half-reaction reaction potentials you might need are: 2 HD(g) H2(g) + D2(g) Kc = 0.28 A) [H+][HCO3-] / [CO2] 20) 6) The equilibrium-constant expression depends on the ________ of the reaction. A. Covalent bond forces Match each term in Column A with its corresponding description in Column B. adulthood. To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. By using Laplace transforms, solve the following differential equations Turkey, (+ A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. At equilibrium the total pressure in the container is 1.300 atm. H2 (g) + I2 (g) 2HI (g) H2 (g) + I2 (g) 2HI (g) For these conditions, what is the value of Kp for the reaction that occurred: Maldives, (+ 1.00 10-14 Belgium, (+ 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ B. 32) Nepal, (+ 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. 4) Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? 44) H2(g) +I2(g) 2HI(g) Using the Equilibrium Constant (cont) E.g.2 For the reaction: PCl5(g) PCl3(g) + Cl2(g), Kc = 0.800 M at 340oC. E) decrease the partial pressure of CO, D) increase the value of the equilibrium constant, 34) Consider the following reaction at equilibrium. Netherlands, (+ 48) This equilibrium is an exothermic one. \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ South Africa, (+ 358) D) 2HI (g) H2 (g) + I2 (g) +1251 J mol-1 A. Q.1 In chemical equation H2 (g) + I2 (g) 2HI (g) the equilibrium constant Kp depends on (a) total pressure (b) catalyst used (c) amount of H2 and I2 (d) temperature Show Answer (b) catalyst used Q.2 If the rate of a reaction is expressed by, rate = A [A] [B], the order of reaction will be (a) 2 (b) 3 (c) 1 (d) 0 Show Answer (b) 3 234) - The relationship between vapor pressure and temperature is linear. 45) E. 0.158. Egypt, (+ E. -91 kJ, Identify an element that is NOT in its standard state. Tajikistan, (+ E) The reaction is at equilibrium when Q = Keq. For a process at constant pressure, 49,600 calories of heat are released.
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