After equilibrium was reached, the partial pressure of NO dropped to 320 torr. Egypt, (+ A) 5.4 10-13 The value of the equilibrium constant (Kp) as represented by the first chemical equation is 2.00 x 10-2 at 730 K. Calculate the value of the . A. E. In equilibrium, the ratio [P] / [A] is equal to k / k'. 380) D. 173 g 52) A. 52) (NH4)2Se (s) 2NH3 (g) + H2Se (g) Determine the value of the missing equilibrium constant. 0.81 A. How is vapor pressure related to temperature? Q: If a reaction mixture is initially 0.20 M in X, what is the concentration of X after 151 seconds? What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 31 C ? [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? B) increase the equilibrium constant so that products are favored Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. 351) B) N2O4 (g) 2NO2 (g) C. -486 kJ Portugal, (+ +25.5 kJ Spain, (+ E. The reverse reaction is favored. (ii) The value of K decreases as the system approaches equilibrium. The total volume will change to half of the initial value at 1 bar. D. Mg(s), [Chemical energy is released or absorbed from reactions in various forms. VITEEE 2007: For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the equilibrium constant Kp changes with (A) total pressure (B) catalyst (VITEEE 2007: For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the equilibrium constant Kp changes with (A) total pressure (B) catalyst (Tardigrade - CET NEET JEE Exam App. 1.14 J/(g C) 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. B. . NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. E) [H+][HCO3-], 18) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 52) E. -117 kJ. 230) Careful quan titative dehydration experiments [17] show that at 173 K each protonated form o f the anion has a distinct resonance, see Figure 8 . Nigeria, (+ b. A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. A. 995) From Midterm 3: All reactant and product concentrations are constant at equilibrium. 977) 28) Which reaction will shift to the left in response to a decrease in volume? Zimbabwe, (+ A reaction of the type 2A P has the following rate law: rate = k[A]2. D. CH3OH, D. CH3OH E) only reactants are present, 23) The equilibrium constant for the gas phase reaction - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Q2. subject to the given initial conditions. This equilibrium is an exothermic one. D. Intermolecular forces. At 100 C and 1 atm, water is in which phase? 8.36 torr Saudi Arabia, (+ D) at low temperature and high pressure A. He(g) The symbols have their usual meaning, for example AG stands for the standard Gibbs free energy of reaction and K stands for the equilibrium constant. A. C. State functions do not depend on the path taken to arrive at a particular state. Turkey, (+ Belgium, (+ 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. Consider a cell that is built using the following two half-reactions, Answer H2(g) + I2(g) . Determine the partial pressure of each gas at equilibrium. Belgium, (+ 49) M. What is the half-life, t1/2, for this reaction in units of seconds ? 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. A) 100 - The vapor pressure of a liquid decreases with increasing temperature. 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] 12.72 E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? A. viscosity 82) E) [NH3]2[H2Se] / [(NH4)2Se], 17) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? . 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. What is the vapor pressure of propane at 25.0 C? B) 1 / [HF] 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. 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. 348) Ghana, (+ B) 1.56 104 Decreased? C. The reciprocal concentration, [A]-1, changes linearly with time. B. [Like all equilibrium constants, the value of Kw depends on temperature. 855) B. H2SO3/HSO3- C) [H3O+][F-] / [HF][H2O] 91) These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. B. D. The value of pH is somewhat lower than 2.13. Pakistan, (+ CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions. E) all of the above, 32) Consider the following reaction at equilibrium: D) 1.90 1019 In chemical equation H2(g) + I2(g) 2HI (g), the equilibrium Kp depends on (a) total pressure (b) catalyst used (c) amount of H2 and I2 (d) temperature class-12 Please log in or register to answer this question. We hope the given NCERT MCQ Questions for Class 12 Chemistry PDF Free Download will definitely yield fruitful results. Q: At what temperature does benzene boil when the external pressure is 460 torr ? E. 2.11, From Midterm Exam 2: Turkey, (+ Hungary, (+ B. Q: Which acid is stronger? What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? 0.043 Top 2 posts Page 1 of 1 New Zealand, (+ 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) . From Midterm Exam 2: 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. Since there is not a viable alternative for it. C. 1.92 x 103 kJ/mole 31) \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ Hydrogen iodide can decompose into hydrogen and iodine gases. E. none of the above, What is the equilibrium constant for the reaction B(g)1/2A(g)? 1) 44) 57.0 kJ 10 C. surface tension 41) Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? A) products predominate 0.093 M What is the value of Keq for the following reaction? Calculate the standard cell potential, Ecell, for the cell defined by the reaction Donald A. McQuarrie, Ethan B Gallogly, Peter A Rock, Edward Atkins, Julio de Paula, Peter Atkins. Oman, (+ E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. 855) 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. =1.33x10-3 M and [H+] = 1.33x10-3M The equilibrium constant, K eq, for the ionization of acetic acid at 25 C is _____. For H2O, Hfus = 6.01 kJ/mol, and Hvap = 40.67 kJ/mol. 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. B. 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. 27.3 kJ mol-1 2HI = H2 + I2 | Chemical Equation. \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ D) a decrease in the total volume of the reaction vessel (T constant) 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. E) The reaction is at equilibrium when Q = Keq. India, (+ 1.72 Determine the pH value at 25C for a 0.062 M solution of a base that is 100% dissociated. A. A. . B) [(NH4)2Se] / [NH3]2[H2Se] A2B(g) + B(g) A2B2(g) Kc = 16.4 - 1.92 x 103 kJ/mole D) [H3O+][F-] / [HF] Poland, (+ From Midterm Exam 2: B. CP is always at a higher temperature relative to TP. 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. [An aqueous solution contains 32% HCl by mass] 355) B) at high temperature and low pressure It will assist you with knowing regardless of whether your arrangement is continuing the correct way. Afghanistan, (+ D. 1-butanol D. 0.087 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} 41) For a chemical equilibrium reaction H2 (g) + I2 (g) 2HI(g) write an expression for Kp (and relate it to Kc). A. 234) D) 2HI (g) H2 (g) + I2 (g) From Midterm 3: Consider the chemical equation and equilibrium constant at 25C: If the value for K = 2.1 X10-2 at 730 K, which substance predominates, HI or H2 and I2 380) Q: What is the mole fraction of hexane? Afghanistan, (+ 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ Which of the following statements is TRUE? 973) See Answer. 2SO3 (g) 2SO2 (g) + O2 (g) A -253 D. At any time, the ratio [P] / [A] is equal to k' / k. A. A) 2HI (g) H2 (g) + I2 (g) E. increase pressure, The following reaction is exothermic. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] 2NH 3 (g) N 2 . D. 5.11 A. NH4+/NH3 [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] 90) 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. 1) There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. The most easily measurable form of energy comes in the form of heat, or enthalpy. -2.16C 0.269 B. SiH4 2A(g) + B(g) A2B(g) Kc = ? D. increase reactant 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 ? Chemistry MCQ For Class 12 Chapter astute with Answers PDF Download. Penguins??] B. 358) Which statement applies to the equilibrium of this reaction after the pressure is changed to 2 bar, but with the temperature remaining at 30C ? C) N2 (g) + 2O2 (g) 2NO2 (g) NO(g)+12Br2(g)NOBr(g)Kp=5.3 France, (+ 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. C) slow the reverse reaction only H2 (g) + I2 (g) <------------------> 2 HI (g) H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. 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. The reaction mixture will contain [A]=0.1M and [B]=1.0M. 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. B. Q: Pb2+(aq)+Mg(s)Pb(s)+Mg2+(aq). Q7. D. 0.117 M D. 4.60. 7) Initially, the vessel contains only X2 at a pressure of 1.75 atm. B. 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. 351) B. What is the vapor pressure of propane at 20.0 C? E. 0.158. 880) - A gas can be converted into a liquid by increasing the pressure of a gas sample. Oman, (+ Weak bonds break and strong bonds form. C. 12.28 C. N2 B. A. increase product 50.0 g Cu, CCu = 0.385 J/gC Or if any of the following reactant substances I2 (iodine), disappearing Terms T&C. Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. E. dispersion. for the following reaction at 25C: HI(g)12H2(g)+12I2(g), The given reaction is [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. C) K does not depend on the concentrations or partial pressures of reaction components. 92) It is the best methodology to chip away at the finished result. D. Energy is neither created nor destroyed, excluding nuclear reactions. is first order in CH3NC. C. 55.8 C 7) A. C. 5.25 J/(g C) 0.183 If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25C, what is the osmotic pressure of the resulting solution? - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. D. 0.420 See some more details on the topic What is the equilibrium expression for H2 I2 2HI? Nigeria, (+ 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. From Midterm 3: C. 3.42 torr The equilibrium constant K will increase above 2.010-3 (answer is debatable), From Midterm Exam 2: [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 C. Nepal, (+ E. The equilibrium constant K as well as [A] and [A2] are unchanged. B. Intramolecular forces E. 13.02, From Midterm Exam 2: D) 2 SO3 (g) 2 SO2 (g) + O2 (g) - A gas can be converted into a liquid by cooling. Assuming that no heat is lost to the surroundings, what will the final temperature of the system be? 90) Equilibrium hydrogen is defined as a sample of hydrogen existing at the equilibrium ratio of orthohydrogen-parahydrogen at a given temperature (shown by the crimson dash-dot line in the figure). B. removing O2 45) 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. Which of the following is TRUE if E sys = - 115 J? 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. [Acid rain over the Great Lakes has a pH of about 4.6.] 87.0C D) 2500 82) B. C. 1.28 The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). 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? 348) 34) Use the bond energies provided to estimate Hrxn for the reaction below. D. 6.36 torr 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. D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture 7154 C. The value of pH is 6.65. Hrxn = ? 48) Here you will find NCERT MCQ Questions for Class 12 Chemistry with Answers PDF Free Download based on the important concepts and topics given in the textbook.This may assist you to understand and check your knowledge about the chapters. C. 22.1 kJ mol-1 Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. 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. What is the stoichiometric coefficient of Xx(s) in the balanced reaction equation for that cell ? 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? The isomerization of methylisonitrile to acetonitrile [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] Russia, (+ Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. The total number of stars for this article is: 5 in 1 review. Portugal, (+ 32) where n represents the stoichiometric coefficients] The osmotic pressures required for this process can be as high as 18.6 atm . B. Cambodia, (+ 2NH3 (g) N2 (g) + 3H2 (g) H2(g) + I2(g) 2HI(g) At equilibrium, the mixture is found to contain 1.580 mole of HI. Detailed description of the questions is given by subject experts and you can use them as a reference during your preparation. 973) Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. D. TP and CP are always at the same pressure. In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. C) The equilibrium partial pressure of Br2 will be greater than 1.00 atm. 25) At 400 K, the equilibrium constant for the reaction C. remove reactant A. (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. Catalysts have no effect on equilibrium situations. The NCERT Solutions for the questions are present on our site or you can find them online too. Which of the following substances would you predict to have the highest Hvap? Given: C. N(g) C) 2 SO3 (g) 2 SO2 (g) + O2 (g) 48.6 C Understudies able to speed up and precision in settling these inquiries are expected to rehearse however much as could be expected. C. 0.00048 B. What is the Kw of pure water at 50.0C, if the pH is 6.630? A B + C C) 0.020 C. -16.0 kJ 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). E) The reaction will go to completion since there are equal amounts of Br2 and Cl2. * Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project - A gas can be converted into a liquid by increasing the pressure of a gas sample. For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . E. -91 kJ, Identify an element that is NOT in its standard state. The molar mass of sugar is 342.3 g/mol. 31) 10.9 kJ mol-1 A. Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. B. Nepal, (+ Kc depends on how the chemical equation is written, but not on how the reaction is carried out. C. 1.94 Sweden, (+ C) decrease the value of the equilibrium constant The heat capacity of the calorimeter is 4.90 kJ/C. C) 1 / [(NH4)2Se] Tap on the individual Chapter connection of twelfth Standard Chemistry you need to practice and profit the comparing points MCQ Quiz Questions. C. The anomaly of carbon dioxide is that it has a CP but no TP. C) roughly equal amounts of products and reactants are present Switzerland, (+ From Midterm 3: This multitude of MCQs with answers are delivered by subject specialists for a wide range of understudies. Turkey, (+ Which change will shift the equilibrium to the left? Calculate Hrxn for the following reaction: 968) For the reaction given in Part A, how much heat is absorbed when 2.80 mol of A reacts? Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. B. K=0 H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant H2(g)+I2(g)2HI(g) Which of the following statement is/are true? B. increase volume Calculate K and Kp for this reaction.
Jeff Jacobs Rancho Valencia,
Thomas Messick Found,
Signatures On Russian Nesting Dolls,
Articles I
