351) 960) 268) A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. A. In a particular experiment, the partial pressures of H 2 and I 2 For the reaction : 2HI(g) H2 (g)+ I2 (g), the degree of dissociated () of HI(g) is related to equilibrium constant Kp by the expression: For the reaction H2(g) + I2(g) 2HI(g) the equilibrium constant kp changes with. D. increase reactant H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant Tajikistan, (+ E) only reactants are present, 22) The equilibrium constant for the gas phase reaction For these conditions, what is the value of Kp for the reaction that occurred: Finland, (+ 90) United States, (+ NCERT Solutions and CBSE MCQs will provide you an in-depth understanding of all the questions and concepts in NCERT Textbooks. 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. H2 + I2 = 2 HI Since there is an equal number of each element in the reactants and products of H2 + I2 = 2HI, the equation is balanced. 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. 2 HD(g) H2(g) + D2(g) Kc = 0.28 N2 (g) + 3H2 (g) 2NH3 (g) From Midterm 3: [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] B) H2 (g) + Cl2 (g) 2 HCl (g) Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. 92) A. South Africa, (+ A. adding SO3 You can utilize the quick links on our page to view or download the CBSE MCQs of all classes in an easy way. 268) United Kingdom, (+ France, (+ A) 2HI (g) H2 (g) + I2 (g) E. +4087 J mol-1, From Midterm Exam 2: D) 2500 A. PO43- D. C2H3O2-/HC2H3O2 See some more details on the topic What is the equilibrium expression for H2 I2 2HI? 2NO(g)N2(g)+O2(g)Kp=2.11030 D. 4.60. 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: For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . A. Erxn can be determined using constant volume calorimetry. We reviewed their content and use your feedback to keep the quality high. is Keq = 4.34 10-3 at 300 C. How reactions can happened and produce H2 (hydrogen) and I2 (iodine) ? The equilibrium constant is given for one of the reactions below. 8.36 torr 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. A) N2 (g) + 3H2 (g) 2NH3 (g) C. -2.97C }}+5y=26e^{3t},~~~~~y_{0}=1,~y_{0}^{^{\prime }}=5. D) only products are present What factors cause changes between the liquid and gas state? Bangladesh, (+ D. If the temperature is raised, then the reverse reaction is favored. A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. Pakistan, (+ -25.5 kJ 91) \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\ Cambodia, (+ The equation for the dissociation of hypochlorous acid is: Write an equilibrium constant expression b. XaO4-(aq) + 4 H+(aq) + 3 e-(aq) XaO2(s) + 2 H2O(l) . 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. B) 0.50 What is the vapor pressure of propane at 25.0 C? 44) 12.72 0.093 M 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. The value of pH is somewhat higher than 6.65. B. At body temperature (37C), Kw=2.41014] Consider the chemical equation and equilibrium constant at 25C: Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. 45) C. CF4 D. +653 J mol-1 C. The anomaly of carbon dioxide is that it has a CP but no TP. Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? The NCERT Solutions for the questions are present on our site or you can find them online too. Maldives, (+ 2HI (g) H2 (g) + I2 (g) A) 100 B) 0.50 C) 0.020 D) 2500 E) -50 C) 0.020 13) The Keq for the equilibrium below is 50. In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. 46) [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] 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) . D. H3PO4 Q: What can you conclude about the equilibrium constant (K) for the reaction? C. 11.70 What is the value of Keq for the following reaction? Hungary, (+ Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. HNO2 4.6104 Turkey, (+ The majority of the boards that prefer the NCERT Textbooks can use these Solutions for getting a grip on the subject. Which metal in the list is the best reducing agent? Saudi Arabia, (+ 992) . E) -50, 13) The Keq for the equilibrium below is 50. If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. This problem has been solved! 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. Mexico, (+ 1) D. capillary action What is the rate constant, k, for this reaction in units of L mol-1 s-1. +1251 J mol-1 The reaction mixture will contain [A]=0.1M and [B]=1.0M. - The relationship between vapor pressure and temperature is linear. 32) 07 H2(g) Nonmetal Gas 2 00 L container and goes to equilibrium at 200 oC 00 L container and goes to equilibrium at 200 oC. AB2(g) + B(g) AB3(g) Kc = ? B. 966) 20) C) slow the reverse reaction only How can I download the CBSE MCQs in PDF Format for free? Determine the value of the missing equilibrium constant. 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. When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. Match each term in Column A with its corresponding description in Column B. adulthood. 2NH3 (g) N2 (g) + 3H2 (g) Portugal, (+ (R = 0.0821 L atm/ (K mol)) A. From Midterm 3: where n represents the stoichiometric coefficients] The osmotic pressures required for this process can be as high as 18.6 atm . 12.30 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. Phenomenon after H2 (hydrogen) reacts with I2 (iodine) This equation does not have any specific information about phenomenon. [A solution contains a mixture of pentane and hexane at room temperature. C. -16.0 kJ B. SiH4 3.48 J/(g C) 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. The most easily measurable form of energy comes in the form of heat, or enthalpy. D. SiF4 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. Mexico, (+ D) N2 (g) + 3H2 (g) 2NH3 (g) D) only products are present Swaziland, (+ E. -117 kJ. A. Finland, (+ Saudi Arabia, (+ Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. These various decision inquiries for twelfth class Chemistry will help you to improve calculated and subject information abilities. 2.34 10-7 Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? After 203 s the concentration of A had fallen to one fifth of the initial value. If the temperature is raised, then the forward reaction is favored. Guinea, (+ Hydrogen iodide can decompose into hydrogen and iodine gases. -4.56C B) 1.56 104 Ghana, (+ 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 . 263) D) 100 D. At any time, the ratio [P] / [A] is equal to k' / k. A. O2 B) increase the equilibrium constant so that products are favored C. HF Turkey, (+ For both acid and base, 'strong' means fully dissociated. 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: [Acid rain over the Great Lakes has a pH of about 4.6.] ), [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Oman, (+ The gases react to form l-l] according to the equation above. +25.5 kJ d. Which metal ion in the list is the easiest to reduce? Determine the equilibrium concentration, [H3BO3], of this weak acid in the solution. Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. A) [SO3] / [SO2][O2] The equilibrium constant K will increase above 2.010-3. C. dipole-dipole 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question A2 (g) 2 A (g). Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as gaining heat from the surroundings? Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is lower than the rate of the reverse reaction. Poland, (+ Arsenic acid (H3AsO4) is a polyprotic acid with Ka1 = 5.510-3, Ka2 = 1.710-7, and Ka3 = 5.110-12. Calculate the equilibrium constant for the following reaction at 25C: The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: Tajikistan, (+ A) the quantities of reactants and . 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. Poland, (+ Mauritius, (+ Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. 380) Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. A. How is vapor pressure related to temperature? For a chemical equilibrium reaction H2 (g) + I2 (g) 2HI(g) write an expression for Kp (and relate it to Kc). 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. At 100 C and 1 atm, water is in which phase? C) 0.020 224) It can be represented as. Bond Bond Energy (kJ/mol) B) N2O4 (g) 2NO2 (g) 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. United Kingdom, (+ Business, Finance, Economics, Accounting, Operations Management, Computer Science, Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical . 91) 6.41 The statements in the tables below are about two different chemical equilibria. Bangladesh, (+ 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. A. 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] Use Q to determine which of the statements below is true. - A gas can be converted into a liquid by cooling. A) 5.26 10-20 B) At equilibrium, the reaction quotient is undefined. Ti (s) + 2Cl2 (g) TiCl4 (l)