H2 (g) + I2 (g)-- > < -- 2HI(g) H=-10.4 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)? Use the following reactions and given H values. MCQ Questions for Class 12 Chemistry Chapter 4 Chemical - CBSE MCQ 348) Q7. Given: C. N(g) Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. C. K>1 Both TP and CP are located on the solid/liquid phase boundary. 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. 0.043 Thank you for your participation! What is the vapor pressure of propane at 25.0 C? Nigeria, (+ The equilibrium constant is given for one of the reactions below. 234) Calculate the pOH of a solution that contains 7.8 x 10-6 M OH- at 25C. D. CH3OH, D. CH3OH So Kp = (PH2) x (PI2) / PHI^2 P = partial pressure France, (+ What is the rate constant, k, for this reaction in units of L mol-1 s-1. Nigeria, (+ 2 HBr(g) H2(g) + Br2(g) Kc = ? Calculate K and Kp for this reaction. PART A: Daily act of different subject shrewd MCQs will assist with fostering a solid comprehension of every theme which you will recollect till date of your tests. CBSE Class 10 Answered - TopperLearning E. The value of pH is 2.13. C. Xd2+ + 2 H+ Xd + H2 The law of ________ states that energy that can be neither created or destroyed. India, (+ Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. B. -2.16C What is the mole fraction xA of liquid A in this mixture. B. A. Russia, (+ 4.19 E) Q is the same as Keq when a reaction is at equilibrium. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction When a reactio. subject to the given initial conditions. A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. C. The bonds that break and those that form are of approximately the same strength. 880) B. H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. 100.0C \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightleftharpoons \mathrm{Ag}(\mathrm{s}) & \text { voltage }=+0.80 \mathrm{~V} \\ A. 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) 0.020 According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? 2HI (g) = H2 (g) + I2 (g) Kp = 0.016 If 2.58 atm of HI (g) is sealed in a flask, what is the partial pressure of each gas. D -511. South Korea, (+ Part A: What is the value of E for the combustion of the fuel? . Le Chtelier's principle predicts that a decrease in temperature will ________. Solved Consider the chemical equation and equilibrium | Chegg.com If the value for K = 2.1 X10-2 at 730 K, which substance predominates, HI or H2 and I2 [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] E. 0.371, From Midterm Exam 2: A compound is found to have a molar mass of 598 g/mol. D. +473 kJ A) the quantities of reactants and . Calculate the standard enthalpy change for the reaction South Korea, (+ What is NCERT Exemplar and where can we get its Solutions? 93) is Keq = 3.6 10-3 at 999 K. At equilibrium, ________. Egypt, (+ 91) 92) E) The reaction is at equilibrium when Q = Keq. Egypt, (+ [Consider these two acids and their Ka values: Mexico, (+ 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? 2CH3NO2(l)+3/2O2(g)2CO2(g)+3H2O(l)+N2(g) Hrxn = -1418 kJ] C) [H+][HCO3-] / [CO2][H2O] Write the overall balanced equation for the reaction. Consider the first-order decomposition of compound A according to C. +873 J mol-1 E. 5.01 torr. E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Georgia, (+ Portugal, (+ Compute the pH at 25C after 3 mL of the base has been added. Bahrain, (+ Poland, (+ Q: What is the percent ionization of ammonia at this concentration? 977) Consider the equilibrium of two (ideal) gases according to 2A A2 with equilibrium constant K = 2.010-3 at a pressure of 1 bar and 30C. - A gas can be converted into a liquid by decreasing the pressure of a gas sample. 1.00 10-14 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . Chemistry MCQ For Class 12 Chapter savvy with answers Online Test is a sort of Mock Test that will assist you with taking care of the few issues of Std twelfth NCERT Chemistry Books. Swaziland, (+ B) the rates of the forward and reverse reactions are equal. Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. D) [SO3]2 / [SO2]2[O2]2 A 43.9-g piece of copper (C_Cu= 0.385 J/gC) at 135.0C is plunged into 254 g of water at 39.0C. D) 1.90 1019 Give the direction of the reaction, if K >> 1. C. 1-pentanol Qc = 0.120 < Kc reaction proceeds to products. A. C) 2 SO3 (g) 2 SO2 (g) + O2 (g) 48.6 C C-H 414 977) 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] Pakistan, (+ Or if any of the following reactant substances I2 (iodine), disappearing A. South Africa, (+ A. Catalysts have no effect on equilibrium situations. E) only reactants are present, 23) The equilibrium constant for the gas phase reaction D. 0.420 Guinea, (+ H2(g)+I2(g)2HI(g) , K=6.2102 . Oman, (+ ASU CHM 118 FINAL EXAM Flashcards | Quizlet B) 2500 52) 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. A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values. PART B: E. increase pressure, The following reaction is exothermic. B. 2 HD(g) H2(g) + D2(g) Kc = 0.28 Albania, (+ H2 + I2 = 2HI | Chemical Equation Which one? For a chemical equilibrium reaction H2 (g) + I2 (g) 2HI(g) write an expression for Kp (and relate it to Kc). 2SO2 (g) + O2 (g) 2SO3 (g) Q3. Sweden, (+ 10.9 kJ mol-1 E) decrease the partial pressure of CO, D) increase the value of the equilibrium constant, 34) Consider the following reaction at equilibrium. Assume excess SiO2. Which metal ion in the list is most difficult to reduce? Here's an example. 0.556 (NH4)2Se (s) 2NH3 (g) + H2Se (g) What is the kc and kp of 2HI (g) H2 (g) + I2 (g)? - Quora Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. B. Georgia, (+ What is the osmotic pressure of this solution at 25 C? 971) D. 32.2 kJ mol-1 Q: What is the mass of the silver block? E. 8.89. B. removing O2 995) 27) [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? The amounts of H 2 and I 2 present D Temperature Medium Solution Verified by Toppr Correct option is D) The equilibrium constant does not change at all with changes in concentrations, volume, pressure, presence of catalyst, etc. 960) 7154 is Keq = 230 at 300 C. B. hydrogen bonding At equilibrium, ________. [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] 8.36 torr Q: What is the theoretical cell potential assuming standard conditions? What is the value of Keq for the following reaction? Experts are tested by Chegg as specialists in their subject area. Which statement is true of an endothermic reaction? 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. +25.5 kJ Switzerland, (+ A -253 The equilibrium constant (K ) would be __________. The reaction : N 2O4 2N O2 J & K CET 2018 8. Consider an acetate buffer that is a mixture of 0.20 M acetic acid and 0.20 M sodium acetate. H2 (g) + I2 (g) 2HI (g) What Is The Equilibrium Expression For H2 I2 2Hi? Quick Answer 3) Which one of the following will change the value of an equilibrium constant? 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ 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. here: 2HI the concentration at equilibrium is H2=I2=HI=4mol/dm A. Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. South Africa, (+ D. C2H3O2-/HC2H3O2 E) 4 Fe (s) + 3 O2 (g) 2 Fe2O3 (s), 29) Which reaction will shift to the right in response to a decrease in volume? 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. Part B: What is the value of H for the combustion of the fuel? Q: Find the value of the [H3O+] of rain over the West Coast that has a pH of 5.5. 6) The equilibrium-constant expression depends on the ________ of the reaction. B. [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. E. 0.169 M, From Midterm Exam 2: What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? E. Xe. The heat capacity of the calorimeter is 4.90 kJ/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. 91) In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends \end{array} Provide your answer in units of volts (V). B) N2 (g) + O2 (g) 2NO (g) Enter the email address you signed up with and we'll email you a reset link. HI(g)12H2(g)+12I2(g), The equilibrium constant is given for one of the reactions below. C. H3O+/OH- 2NH3 (g) N2 (g) + 3H2 (g) 2003-2023 Chegg Inc. All rights reserved. 960) Since there is not a viable alternative for it. A.1.89 103 J D) 100 Two liquids, labeled A and B, form an ideal mixture with total vapor pressure P = 324.4 torr at a certain composition. - 1.92 x 103 kJ/mole At body temperature (37C), Kw=2.41014] 27) How is the reaction quotient used to determine whether a system is at equilibrium? 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. B. D) 2N2 (g) + O2 (g) 2 O (g) F 2100 universal tv remote manual ethanol is capable of forming hydrogen bonds with water good breakfast cereal for type 2 diabetes naturally with diet Of the three basic states of matter, the particles in gas are much . Exams . Q: Calculate the [H3O+] of this rain. 355) 224) Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane? In chemical equation H2 (g) I2 (g) 2HI (g) the equilibrium constant C. 150 g From Midterm Exam 2: New Zealand, (+ C. 62.5C 15.5: Calculating Equilibrium Constants - Chemistry LibreTexts 1/2 N2(g) + O2(g) NO2(g) Hrxn = +33 kJ A. 7) Belgium, (+ B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. 7) France, (+ The equilibrium constant K p is independent of (A) Total pressure (B) Catalyst (C) The amounts of H 2 and I 2 present However, it changes with Temperature 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. Xn2+ + 2 e- Xn(s) : E = 1.33 V D. ion-dipole The value of pH is somewhat higher than 2.13. 971) 25) At 400 K, the equilibrium constant for the reaction D. 0.117 M [An aqueous solution contains 32% HCl by mass] B) H2 (g) + Cl2 (g) 2 HCl (g) D) at low temperature and high pressure B. C6H6 C) N2 (g) + 3H2 (g) 2 NH3 (g) 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. PDF 5.9 10 -3 - gccaz.edu E) The reaction is at equilibrium when Q = Keq. DOC Chapter 14 - CHEMICAL EQUILIBRIUM Turkey, (+ What is the primary source of water stored in an aquifer? B. Hrxn can be determined using constant pressure calorimetry. 358) D. CO E. -1.35C. Poland, (+ B. density The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] E) only reactants are present. At 100 C and 1 atm, water is in which phase? Netherlands, (+ Understudies who wish to hone their insight into Chemistry. B.54.4 J 82) B. 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. Hydrogen bonding is a strong intermolecular force that makes this substance a liquid at room temperature), Identify the term used to describe the ability of a liquid to flow against gravity up a narrow tube. By clicking Agree & join, you agree to the Study24x7 992) y+4y+5y=26e3t,y0=1,y0=5.y^{^{\prime \prime }}+4y^{^{\prime D) The reaction is at equilibrium when Q > Keq. D. 1.72 J/(g C), The temperature rises from 25.00C to 29.00C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. A) [H+][HCO3-] / [CO2] 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 B. 880) 52) 968) To score well take a stab at rehearsing the rundown of Multiple Choice Type Questions gave in the connections underneath. After 203 s the concentration of A had fallen to one fifth of the initial value. Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. B. Afghanistan, (+ - A gas can be converted into a liquid by cooling. 0.21 M B. D) a decrease in the total volume of the reaction vessel (T constant) 64) The equilibrium constant K will increase above 2.010-3 (answer is debatable), From Midterm Exam 2: A) products predominate A. ion-ion These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. The total number of stars for this article is: 5 in 1 review. Guinea, (+ A 250 mL sealed flask contains 0.65 g of butane at 22C.] 57.0 kJ CHAPTER 15: CHEMICAL EQUILIBRIUM Flashcards | Quizlet E. CP is always at a lower temperature relative to TP. (Pg.5) (c) Isobaric process:- An isobaric process is In a homogeneous equilibrium, all the defined as one in which the pressure of the reactants and products are in the same phase. B) reactants predominate Netherlands, (+ 973) A. PO43- E. +4087 J mol-1, From Midterm Exam 2: for the following reaction at 25C: HI(g)12H2(g)+12I2(g), The given reaction is Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. H2 (g) + I2 (g) <------------------> 2 HI (g) C. 0.222 ICEchart - Purdue University 33) Q: At what temperature does benzene boil when the external pressure is 460 torr ? D. 1-butanol B. 0.269 Which of the following statements is TRUE? CH4(g)+2Cl2(g)CH2Cl2(g)+2HCl(g) B. Consider the chemical equation and equilibrium constant at 25C: h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. 2A(g) + B(g) A2B(g) Kc = ? 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. Equilibrium Constant Kp Definition And Examples - Chemistry Dictionary We hope the given CBSE MCQs for Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12th all subjects will help you. Calculate the equilibrium constant for the following reaction at 25C: 230) A2B(g) + B(g) A2B2(g) Kc = 16.4 Sn(s)|Sn2+(aq)NO(g)|NO3(aq),H+(aq)|Pt(s), 3Sn(s)+2NO3(aq)+8H+(aq)3Sn2+(aq)+2NO(g)+4H2O(l), [Use tabulated half-cell potentials to calculate Grxn for each of the following reactions at 25 C] . 2. Consider the reaction: H2 (g) + 12 (9) ~ 2 HI (g) Kp = 92.6 What factors cause changes between the liquid and gas state? Le Chtelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction ________. 6.41 1.72 When a liquid evaporates in a closed container, molecules with relatively higher kinetic energy escape the liquid surface into the vapour phase and number of liquid molecules from the vapour phase strike the liquid surface and are retained in the liquid phase. Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. Calculate Hrxn for the following reaction: A. 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. D. 40.5C A) 100 There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. \mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Co}(\mathrm{s}) & \text { voltage }=-0.28 \mathrm{~V} \\ B. C) 5.4 1013 5.99 torr 49) Considering H2(g) + I2(g) 2HI and a temperature of 731K; 2.40 mol of B. A. HC2H3O2 1.8105] Each question has four options followed by the right answer. E. -24.5 kJ, Calculate the amount of heat (in kJ) required to raise the temperature of a 79.0 g sample of ethanol from 298.0 K to 385.0 K. The specific heat capacity of ethanol is 2.42 J/gC. Determine the pH value at 25C for a 0.062 M solution of a base that is 100% dissociated. [A silver block, initially at 58.8 C, is submerged into 100.0 g of water at 25.0 C, in an insulated container. 12.72 A. Determine the value of the missing equilibrium constant. D. 5.11 A reversible reaction can proceed in both the forward and backward directions. C) roughly equal amounts of products and reactants are present is first order in CH3NC. Saudi Arabia, (+ Using the equilibrium constant calculated in 2, calculate . D. capillary action You can likewise reconsider all Chemistry sections appropriately and save time during your group tests and tests. For both acid and base, 'strong' means fully dissociated. Saudi Arabia, (+ A. viscosity Maldives, (+ 11) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. A) N2 (g) + 3H2 (g) 2NH3 (g) D. - 1.23 x 103 kJ/mole. Which metal in the list is the best reducing agent? 960) A. Albania, (+ 15.2: The Equilibrium Constant (K) - Chemistry LibreTexts E. none of the above. Understudies who are planning for State board assessments in Chemistry like PUC, Intermediate tests, and so on. D. 1, The equilibrium constant is given for two of the reactions below. CBSE Textbooks can be great to guide you for any exam and has detailed solutions for the questions. What is the boiling point of water at an elevation of 1.00104 ft ? Determine the cell notation for the redox reaction given below. Understudies who are getting ready for Online/Offline Tests/Contests in Chemistry for class 12. Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. 0.81 48) Q: What is the [H3O+] in pure water at body temperature? B. C. The value of pH is 6.65. A) 5.26 10-20 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. Understudies who are getting ready for designing and clinical selection tests like NEET, IIT JEE, AIIMS, JIPMER and SAT Exams in Chemistry. Bangladesh, (+ In each table, there may be one statement that is false because it contradicts the other three statements. 1.14 J/(g C) C) [H3O+][F-] / [HF][H2O] A2 (g) 2 A (g). The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. C. The reaction mixture will contain equal concentrations of A and B. 880) A) [NH3][H2Se] / [(NH4)2Se] Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. Germany, (+ C. remove reactant 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. B. Part A: Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. Russia, (+ E. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? 93) Which of the following is TRUE if E sys = - 115 J? AB2(g) + B(g) AB3(g) Kc = ? Zimbabwe, (+ A) some removal of from the reaction vessel (V and T constant) 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? B) reactants predominate Decreased? United States, (+ 2HI (g) H2 (g) + I2 (g) C) 6.44 105 H2(g)+I2(g)2HI(g) Which of the following statement is/are true?
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