Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. Turkey, (+ B) increase the partial pressure of CO2 (g) H2 (g) + I2 (g) <------------------> 2 HI (g) 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] Which of the following substances would you predict to have the highest Hvap? E. methanol, Give the major force between ethanol and water. - A liquid can be converted to a gas by heating. 45) Netherlands, (+ B) [SO2] / [SO3] Bahrain, (+ B. The total volume will change to half of the initial value at 1 bar. E. 13.02, From Midterm Exam 2: 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. 224) 973) E) [H+][HCO3-], 18) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? E) none of the above, 12) The Keq for the equilibrium below is 50. Which statement is true at equilibrium? If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. The heat capacity of the calorimeter is 4.90 kJ/C. Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? B. Intramolecular forces B. D. 0.420 E. All of the above are true. What is the best strategy while answering the Multiple Choice Questions for exams? E. 1.62. 0.13 M C. 4.3 M D. 0.039 M From Midterm 3: The value of pH is somewhat higher than 6.65. A. Xd + 2 H+ Xd2+ + 2 H2 A. H2(g) 64) South Korea, (+ 348) Substance Hf (kJ/mol) E. All of the above are conjugate acid-base pairs. E. H3O+. E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. C. The value of K remains, but the equilibrium is shifted towards more reactants. 64) What is the boiling point of water at an elevation of 1.00104 ft ? B) At equilibrium, the reaction quotient is undefined. Additionally, the Online Multiple decision questions will give you certainty to show up in the board test and take care of the complicated issues quicker. Cd(s) + 2 Ag+(aq) Cd2+(aq) + 2 Ag(s), Calculate E cell D. 0.117 M H2(g)+I2(g)2HI(g) Which of the following statement is/are true? 87.0C - A gas can be converted into a liquid by increasing the pressure of a gas sample. D. 1-butanol What is the osmotic pressure of a solution made by dissolving 45.0 g of glucose, C6H12O6, in enough water to form 225.0 mL of solution at 36.0 C ? Check all that apply. HC2H3O2 1.8105] A) decrease the partial pressure of O2 (g) Q7. 358) A. 224) Q2. C) 7.07 971) For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction 27) How is the reaction quotient used to determine whether a system is at equilibrium? Nigeria, (+ Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Pocket (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on Skype (Opens in new window), Click to share on WhatsApp (Opens in new window), General Principles and Processes of Isolation of Elements Class 12 MCQ Questions, The p-Block Elements Class 12 MCQ Questions, The d-and f-Block Elements Class 12 MCQ Questions, Coordination Compounds Class 12 MCQ Questions, Haloalkanes and Haloarenes Class 12 MCQ Questions, MCQ Questions for Class 12 Chemistry Chapter 1 The Solid State with Answers, MCQ Questions for Class 12 Chemistry Chapter 2 Solutions with Answers, MCQ Questions for Class 12 Chemistry Chapter 3 Electrochemistry with Answers, MCQ Questions for Class 12 Chemistry Chapter 5 Surface Chemistry with Answers, MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers, MCQ Questions for Class 12 Chemistry Chapter 7 The p-Block Elements with Answers, MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements with Answers, MCQ Questions for Class 12 Chemistry Chapter 9 Coordination Compounds with Answers, MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers, Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download. Mauritius, (+ Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. E. 8.89. 46) Which statement applies to the equilibrium of this reaction after the pressure is changed to 2 bar, but with the temperature remaining at 30C ? A) 2HI (g) H2 (g) + I2 (g) E. All of these have intermolecular forces stronger than dispersion. Q: What is the [H3O+] in pure water at body temperature? Georgia, (+ D) At equilibrium, the total pressure in the vessel will be less than the initial total pressure. A.1.89 103 J For both acid and base, 'strong' means fully dissociated. 2 NO(g) + O2(g) ' 2 NO2(g) Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. A. K<1 2 HBr(g) H2(g) + Br2(g) Kc = ? Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. - A liquid can be converted to a gas by cooling. 355) D. 5.50 10-14 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: 7.2 10-5 M Spain, (+ - A liquid can be converted to a gas by heating. South Africa, (+ By this, you can dominate CBSE Class 12 Chemistry and play with words without any problem. B. C. 0.037 - The vapor pressure of a liquid increases with increasing temperature. CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) B. [Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. C-O 360 Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. D) 2 SO3 (g) 2 SO2 (g) + O2 (g) D. +473 kJ A) 5.26 10-20 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. C. 11.70 Belgium, (+ (b)(b)(b) How much time does it take the crate to travel to the top of the ramp? C. Xd2+ + 2 H+ Xd + H2 For the reaction given in Part A, how much heat is absorbed when 2.80 mol of A reacts? [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. 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. A. ion-ion Exams . A. F2 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. Bangladesh, (+ HNO2 4.6104 A. PO43- Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.] E. Xe. What is the rate constant, k, for this reaction in units of L mol-1 s-1. 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. 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. Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? }}+5y=26e^{3t},~~~~~y_{0}=1,~y_{0}^{^{\prime }}=5. 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. At equilibrium, ________. @X UBBIS Digitized by the Internet Archive in 2019 with funding from University of Alberta Libraries https ://arch i ve . Mauritius, (+ Russia, (+ B) Keq does not change with temperature, whereas Q is temperature dependent. New Zealand, (+ Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ B) [(NH4)2Se] / [NH3]2[H2Se] E. 0.158. 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? Bangladesh, (+ Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. 49) Kc depends on how the chemical equation is written, but not on how the reaction is carried out. What is the primary source of water stored in an aquifer? system remains constant during its change from Examples:- (i) H2(g) + I2(g) 2HI(g) the initial to final state. For a process at constant pressure, 49,600 calories of heat are released. D) 2N2 (g) + O2 (g) 2 O (g) 2COF2(g)CO2(g)+CF4(g), Kc=6.30 C) at low temperature and low pressure Ghana, (+ C) roughly equal amounts of products and reactants are present The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . Xn2+ + 2 e- Xn(s) : E = 1.33 V D. - 1.23 x 103 kJ/mole. Consider the following chemical reaction: H2 (g) + I2 (g) <> 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. [An aqueous solution contains 32% HCl by mass] C. OH- 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 After equilibrium was reached, the partial pressure of NO dropped to 320 torr. From Midterm 3: From Midterm 3: Understudies who are planning for State board assessments in Chemistry like PUC, Intermediate tests, and so on. C) The reaction is at equilibrium when Q < Keq. 2NO(g)N2(g)+O2(g)Kp=2.11030 B. h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? The people who need to get the passing marks in the CBSE class twelfth board test can use the Chemistry Multiple choice requests to practice. The NCERT Solutions for the questions are present on our site or you can find them online too. The isomerization of methylisonitrile to acetonitrile Georgia, (+ How is vapor pressure related to temperature? Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Write the overall balanced equation for the reaction. A) [SO3] / [SO2][O2] Q: What is the theoretical cell potential assuming standard conditions? Georgia, (+ A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. Ukraine, (+ By clicking Agree & join, you agree to the Study24x7 Assume excess SiO2. For the reaction H2(g) + I2(g) 2HI (g), the standard free energy is G^ > 0. 351) - The relationship between vapor pressure and temperature is linear. [A solution contains a mixture of pentane and hexane at room temperature. Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. Albania, (+ After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. A) Q does not change with temperature. If the equilibrium constants for the formation of H S from H 2S is 1.0 107 and that of S 2 from H S ions is 1.2 1013 then the concentration of S 2 ions in aqueous solution is - JEE Main 2018 9. - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. CH3NC(g) CH3CN(g) When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. The equation for the dissociation of hypochlorous acid is: E. The equilibrium constant K as well as [A] and [A2] are unchanged. Swaziland, (+ H2(g) + I2(g) . The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. A) 5.4 10-13 Rating: 5 / 5 stars. HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). Q: Find the value of the [H3O+] of rain over the West Coast that has a pH of 5.5. The solution has a vapor pressure of 245 torr . 0.233 M Energy can be transferred in many ways, one of which is in the form of work. A) The reaction quotient must be satisfied for equilibrium to be achieved. Consider the following reactions,(a) H2(g) + I2(g) 2HI(g)(b) CaCO2(s) CaO(s) + CO2(g)(c) S(s) + 3F2(g) SF6(g), The value of Kc for the reaction 2HI (g) H2 (g) + I2 (g) is 1 10^4 At a given time, the composition of reaction mixture is. Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. 992) Match each term in Column A with its corresponding description in Column B. adulthood. What is the osmotic pressure of this solution at 25 C? A B + C Thank you for your participation! The osmotic pressures required for this process can be as high as 18.6 atm . Hungary, (+ [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] What is dynamic equilibrium? B. Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. D. The value of pH is somewhat lower than 2.13. What happens to the vapor pressure of a substance when the temperature is increased? Afghanistan, (+ 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] Spain, (+ [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] After 203 s the concentration of A had fallen to one fifth of the initial value. C. 5.25 J/(g C) 27) 992) 2HI(g); Equilibrium is the exact balancing of two opposing processes. Bond Bond Energy (kJ/mol)
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