Guinea, (+ How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? 1.00 10-14 87.0C 351) South Africa, (+ H2(g)+I2(g)2HI(g) Which of the following statement is/are true? E. 9.40, A mixture containing 20.6 g of ice (at exactly 0.00 C) and 70.3 g of water (at 62.9 C) is placed in an insulated container. B. [A] and [P] denote the concentrations of A and P, respectively. Asked by sumandeesinghrana | 12 Oct, 2010, 03:00: PM Expert Answer Dear Student For the reaction H 2 + I 2 --------> 2HI ..Keq = 6.2 x 10^2 Guinea, (+ 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) N2 (g) + 3H2 (g) 2 NH3 (g) South Africa, (+ South Africa, (+ Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. Pakistan, (+ 355) a. Each question has four options followed by the right answer. From Midterm Exam 2: Refer to the list of electrode potentials below to answer parts a to d. Ag+(aq)+eAg(s)voltage=+0.80VCo2+(aq)+2eCo(s)voltage=0.28VCu2+(aq)+2eCu(s)voltage=+0.34VPb2+(aq)+2ePb(s)voltage=0.13VZn2+(aq)+2eZn(s)voltage=0.76V\begin{array}{ll} A. C. CF4 A) at high temperature and high pressure B. The best strategy to follow while answering the MCQ Questions for exams is to go through the question as many times as possible and understand it clearly. 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. 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? B) reactants predominate 380) - A gas can be converted into a liquid by increasing the pressure of a gas sample. Compute the pH at 25C after 3 mL of the base has been added. D. At any time, the ratio [P] / [A] is equal to k' / k. B. density D. The value of K remains, but the equilibrium is shifted towards more products. E. There is not enough information to calculate the Kw. 977) Detailed description of the questions is given by subject experts and you can use them as a reference during your preparation. -1282 kJ B. Zimbabwe, (+ 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. 2NH3 (g) N2 (g) + 3H2 (g) 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. 3. \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\ What state transition or transistions occur in carbon dioxide if you begin with a sample of carbon dioxide at 60.0 C at 50.0 atm and warm the sample to 10.0 C and 50.0 atm? A) N2O4 (g) 2NO2 (g) What is the osmotic pressure of this solution at 25 C? C 185 Use the following data: B.54.4 J E) The reaction is at equilibrium when Q = Keq. E. methanol, Give the major force between ethanol and water. Hrxn = ? CH4(g)+Cl2(g)CH3Cl(g)+HCl(g), H=99.60 kJ 20) Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is higher than the rate of the reverse reaction. 64) Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. B. H2SO3/HSO3- The gases react to form l-l] according to the equation above. A. In this case, you just need to observe to see if product substance HI (hydroiodic acid), appearing at the end of the reaction. After a sufficiently long time, [A] will approach zero, regardless of the values of k and k'. C. 2.8 10-5 M [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] - The vapor pressure of a liquid increases with increasing temperature. 7) The isomerization of methylisonitrile to acetonitrile Which metal in the list is the best reducing agent? Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. 92) 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. N2(g)+O2(g)+Br2(g)2NOBr(g). 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. A -253 2A(g) + B(g) A2B(g) Kc = ? E. The reverse reaction is favored. A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values. 5.99 torr E. 5.01 torr. Rehearsing NCERT Online Chemistry Objective Questions For Class 12 Pdf Answers is perhaps the most ideal way to plan for the CBSE Class 12 board test. A) increase the rate of the forward reaction only B. Intramolecular forces Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. 2A+B2C+2D H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 C) decrease the value of the equilibrium constant E) only reactants are present, 22) The equilibrium constant for the gas phase reaction Spain, (+ For these conditions, what is the value of Kp for the reaction that occurred: Chemistry MCQ For Class 12 Chapter astute with answers PDF Download records are given here free of charge of cost. XaO4-(aq) + 4 H+(aq) + 3 e-(aq) XaO2(s) + 2 H2O(l) . B. HPO42- A. 46) 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: Thank you for your participation! is Keq = 4.34 10-3 at 300 C. Energy can be transferred in many ways, one of which is in the form of work. but the same value of Kc will be obtained at a given temperature. 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? It will assist you with knowing regardless of whether your arrangement is continuing the correct way. Provide your answer in units of volts (V). 45) E. -117 kJ. 7) C) K does not depend on the concentrations or partial pressures of reaction components. C) slow the reverse reaction only C. 840 J Utilizing the assets accessible you can score well in the test. United Kingdom, (+ 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). 2HI = H2 + I2 | Chemical Equation. C) 7.07 Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Determine the pH value at 25C for a 0.062 M solution of a base that is 100% dissociated. 33) Xs3+ + 3 e- Xs(s) : E = -0.55 V 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 ? 966) What is the mole fraction xA of liquid A in this mixture. E) -50, 13) The Keq for the equilibrium below is 50. C. N(g) D) N2 (g) + 3H2 (g) 2NH3 (g) 995) Hungary, (+ D. ion-dipole +1251 J mol-1 880) SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) Hrxn = -184 kJ - The relationship between vapor pressure and temperature is linear. E) all of the above, 32) Consider the following reaction at equilibrium: In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. Terms T&C. 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: Strong bonds break and weak bonds form. E. dispersion. E. In equilibrium, the ratio [P] / [A] is equal to k / k'. }}+5y=26e^{3t},~~~~~y_{0}=1,~y_{0}^{^{\prime }}=5. D. H3PO4 Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. Using the equilibrium constant calculated in 2, calculate . 960) [Seriously? [Acid rain over the Great Lakes has a pH of about 4.6.] A. If the value for K = 2.1 X10-2 at 730 K, which substance predominates, HI or H2 and I2 234) A) products predominate In a cell defined by Xs(s) | Xs2+(aq) || Xo3+(aq) | Xo(s), what amount of charge q needs to run through the cell to add 0.25 g of Xo(s) with atomic mass 107 g mol-1 to the electrode. D. 0.117 M B) [SO2] / [SO3] 224) 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. Catalysts have no effect on equilibrium situations. 26) Which of the following statements is true? Determine the cell notation for the redox reaction given below. C. K>1 is first order in CH3NC. C. -16.0 kJ B. B. Denmark, (+ h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. 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: 233) 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] After the reaction reaches equilibrium, the total pressure is 2.65 atm.] France, (+ A. 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. 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. Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. 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) . Q: Find the volume of methane measured at 298 K and 1.72 atm required to convert 0.620 L of water at 298 K to water vapor at 373 K. The enthalpy change for converting 1.00 mol of ice at -50.0C to water at 70.0C is __________ kJ. PART A: 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. HF (aq) + H2O (l) H3O+ (aq) + F- (aq) This multitude of MCQs with answers are delivered by subject specialists for a wide range of understudies. E. 0.158. From Midterm 3: 20) E) only reactants are present, 23) The equilibrium constant for the gas phase reaction [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. Bangladesh, (+ D. 5.50 10-14 Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? (look up phase diagram). Which one? Consider a cell that is built using the following two half-reactions, 0.269 What is the standard free energy change (Grxn) for this reaction? D. 456 kJ - The vapor pressure of a liquid decreases with increasing temperature. Q: Which acid is stronger? E. 13.02, From Midterm Exam 2: C. Ionic bond forces @X UBBIS Digitized by the Internet Archive in 2019 with funding from University of Alberta Libraries https ://arch i ve . E. none of the above. Which change will shift the equilibrium to the left? 1.14 J/(g C) Consider the first-order decomposition of compound A according to Q6. A) some removal of from the reaction vessel (V and T constant) C. dipole-dipole 968) - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Mauritius, (+ NCERT CBSE KVS Class 12 Chemistry MCQs will assist the children with reinforcing ideas and further develop marks in tests and tests. Swaziland, (+ 17-2 The value of Q increases as a function of time until it reaches the value of K. b) No, Q would still increase with time because the [I2] would decrease in exactly the same way as [H2] decreases. 855) Or if any of the following reactant substances I2 (iodine), disappearing 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 Two liquids, labeled A and B, form an ideal mixture with total vapor pressure P = 324.4 torr at a certain composition. 2.34 10-7 Turkey, (+ Calculate the standard cell potential, Ecell, for the cell defined by the reaction B) [CO2] / [H+][HCO3-] If the temperature is raised, then the forward reaction is favored. E) an increase in total pressure by the addition of helium gas (V and T constant), B) a decrease in the total pressure (T constant), 33) Consider the following reaction at equilibrium: 32) Oman, (+ What is the rate constant, k, for this reaction in units of L mol-1 s-1. A) 5.26 10-20 -333 kJ The heat capacity of the calorimeter is 4.90 kJ/C. Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. E) Q is the same as Keq when a reaction is at equilibrium. E. CP is always at a lower temperature relative to TP. 2075 28.4 kJ Qc = 0.120 < Kc reaction proceeds to products. (i) The value of K increases as the system approaches equilibrium. B. D. 12.79 992) 27) 1-propanol The value of pH is somewhat higher than 2.13. 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 ? (Remember that 101.3 J = 1 L atm) HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . B) 1 / [HF] A second-order reaction of the type 2A P was carried out in a solution with the initial concentration of A being [A]0 = 1.5 mol L-1. 348) +206 kJ While the crate is moving, the ramp exerts a constant frictional force on it that has magnitude 65.0N65.0 \mathrm{~N}65.0N. (a)(a)(a) What is the total work done on the crate during its motion from the bottom to the top of the ramp? 2 HBr(g) H2(g) + Br2(g) Kc = ? H2 (g) + I2 (g) 2HI (g) A. 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. D. Intermolecular forces. 224) User Agreement,Privacy Policy D. increase reactant Calculate the equilibrium constant for the following reaction at 25C: A. B. CP is always at a higher temperature relative to TP. C. 3.42 torr [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] D. 173 g This equilibrium is an exothermic one. C. The anomaly of carbon dioxide is that it has a CP but no TP. Xx+(aq) + e-(aq) Xx(s) , E. 0.371, From Midterm Exam 2: A. 27) Afghanistan, (+ 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. Initially, the vessel contains only X2 at a pressure of 1.75 atm. 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . Download the Study24x7 App, so you can connect and collaborate. What factors cause changes between the liquid and gas state? The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. E. All of the above are true. B. (Assume ideal behavior.). 2 Xs(s) + 3 Xn2+(aq) 2 Xs3+(aq) + 3 Xn(s) . B. The equilibrium-constant expression depends on the _____ of the reaction. A. Covalent bond forces C. 1.94 93) Le Chtelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction ________. Reaction rates but not the rate constants k and k' depend on temperature. Q: What is the mole fraction of hexane? corresponds to which redox cell reaction ? Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. C. surface tension Ukraine, (+ Solution Verified by Toppr Correct option is D) For the reaction, H 2(g)+I 2(g)2HI(g), the number of moles of gaseous reactants is equal to the number of moles of gaseous products.

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