D. 5.11 31) Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? (+ \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cu}(\mathrm{s}) & \text { voltage }=+0.34 \mathrm{~V} \\ - A gas can be converted into a liquid by cooling. [The reaction X2(g)2X(g) occurs in a closed reaction vessel at constant volume and temperature. 07: Equilibrium / Chemistry Part-I - philoid.com C) 5.4 1013 For benzoic acid, Ka=6.5105. 6.41 Key points. 2 NO(g) + O2(g) ' 2 NO2(g) Guinea, (+ D) a decrease in the total volume of the reaction vessel (T constant) 0.233 M You'll get a detailed solution from a subject matter expert that helps you learn core concepts. [Acid rain over the Great Lakes has a pH of about 4.6.] B) N2O4 (g) 2NO2 (g) Bond Bond Energy (kJ/mol) B. CP is always at a higher temperature relative to TP. C. -16.0 kJ D. The value of pH is somewhat lower than 2.13. South Korea, (+ A. For a process at constant pressure, 49,600 calories of heat are released. B. H2SO3/HSO3- 32) 2HI leftharpoons H2 + I2 . Kp is - Tardigrade D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture A. BF3 2 HBr(g) H2(g) + Br2(g) Kc = ? Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. D) only products are present 41) C. 1-pentanol From Midterm 3: D) [H3O+][F-] / [HF] . D -511. 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. 973) 1.00 10-14 A) decrease the partial pressure of O2 (g) B. So, visit our site and easily find MCQs for all subjects classwise. 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} Strong bonds break and weak bonds form. 7.2 10-5 M 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. Turkey, (+ Q: How long will it take for 15% of the U238 atoms in a sample of U238 to decay? B) Keq does not change with temperature, whereas Q is temperature dependent. (Methanol ( CH3OH ) contains hydrogen directly bonded to oxygen, so it has hydrogen bonding. A. Determine the value of the missing equilibrium constant. N2 (g) + 3H2 (g) 2NH3 (g) Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. B) 1.56 104 . 2 NO (g) N2 (g) + O2 (g). The equilibrium constant is given for one of the reactions below. Russia, (+ 268) A. NH4+/NH3 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. United Arab Emirates, (+ What is the value of Keq for the following reaction? 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: Georgia, (+ 57.0 kJ [Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. After 203 s the concentration of A had fallen to one fifth of the initial value. At equilibrium the total pressure in the container is 1.300 atm. Polyoxometalate Molecular Science [PDF] [534rrp5c23v0] Formation of HI from H2 and I2 - Equilibrium constants in terms of B. E) Q is the same as Keq when a reaction is at equilibrium. Calculate K and Kp for this reaction. (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. 2NO(g)N2(g)+O2(g)Kp=2.11030 with forward (A P) rate constant k and reverse (A P) rate constant k' is correct? Germany, (+ 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. \mathrm{~Pb}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Pb}(\mathrm{s}) & \text { voltage }=-0.13 \mathrm{~V} \\ Experts are tested by Chegg as specialists in their subject area. Nepal, (+ 90) Which one? Hrxn = ? The specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. B) N2 (g) + O2 (g) 2NO (g) D. 0.420 Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. 10 The heat capacity of the calorimeter is 4.90 kJ/C. A. C. OH- 92) The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). 995) (look up carbon dioxide phase diagram), Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? 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 For the reaction H 2( g )+ I 2( g ) longrightarrow 2 HI ( g ), the O2(g)+2H2O(l)+4Ag(s) 4OH(aq)+4Ag+(aq). [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] - The relationship between vapor pressure and temperature is linear. Saudi Arabia, (+ 992) 2075 Find the equilibrium amounts of these compounds if they all start out at 0.120 M. Solution: Determine Qc so that you know which direction the reaction will proceed. D. 12.9 kJ A.1.89 103 J B. D. increase reactant Two liquids, labeled A and B, form an ideal mixture with total vapor pressure P = 324.4 torr at a certain composition. D. Intermolecular forces. To have a decent groundwork for your impending board test then you should endeavor these internet based tests for Chemistry. C. 12.54 50.0 g Cu, CCu = 0.385 J/gC He(g) At body temperature (37C), Kw=2.41014] According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? +238 kJ 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] 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. Zimbabwe, (+ 358) (Assume ideal behavior.). E. 2.11, From Midterm Exam 2: For the reaction, H2(g) + I2(g) 2HI(g) , the equilibrium constant Kp Determine the partial pressure of each gas at equilibrium. 45) C. 22.1 kJ mol-1 Germany, (+ C. 3.42 torr D. 4.60. Determine the equilibrium concentration, [H3BO3], of this weak acid in the solution. 26) Which of the following statements is true? C. 12.28 92) 880) Maldives, (+ C. +115 kJ H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 Determine the value of the missing equilibrium constant. A. D) only products are present C. 0.222 A. Finland, (+ B. Phenomenon after H2 (hydrogen) reacts with I2 (iodine) This equation does not have any specific information about phenomenon. B) H2 (g) + Cl2 (g) 2 HCl (g) D. H3PO4 Which change will shift the equilibrium to the left? Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. B. Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. CBSE MCQs lay a stronger foundation of concepts in students that can be useful for them in their later stages to prepare for any competitive exams. H2 (g) + I2 (g) 2HI (g) What is the value of Keq for the following reaction? 977) [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] 64) After the reaction reaches equilibrium, the total pressure is 2.65 atm.] 7154 C. 1.92 x 103 kJ/mole Netherlands, (+ - A gas can be converted into a liquid by cooling. 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. B. C. dipole-dipole [A] and [P] denote the concentrations of A and P, respectively. 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. C. Neither direction is favored. Sweden, (+ A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. . Download the Study24x7 App, so you can connect and collaborate. Strong bonds break and weak bonds form. C. -486 kJ -1282 kJ 263) India, (+ Guinea, (+ 1.9 10-4 M - A liquid can be converted to a gas by cooling. C=O 799 11.90 A. A. 2NH3 (g) N2 (g) + 3H2 (g) A. Belgium, (+ In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. A) 5.26 10-20 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 . 0.556 A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. 64) 348) Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. 10.9 kJ mol-1 268) By clicking Agree & join, you agree to the Study24x7 Finland, (+ E. -1.35C. B. A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values. A. D. CH3OH, D. CH3OH Q: What is the half-life for this reaction? 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. (ii) The value of K decreases as the system approaches equilibrium. 855) 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ B. Intramolecular forces C. raising the temperature The value of pH is somewhat higher than 6.65. The equilibrium constant (K ) would be __________. 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] [The decomposition of SO2Cl2 is first order in SO2Cl2 and has a rate constant of 1.46104 s1 at a certain temperature] When a reaction component is a gas, we can also express the amount of that chemical at equilibrium in terms of its partial pressure. here: 2HI the concentration at equilibrium is H2=I2=HI=4mol/dm 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. Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. Q: What is the mass of the silver block? 0.81 Q: Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent? 234) 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. In each table, there may be one statement that is false because it contradicts the other three statements. Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. Tajikistan, (+ From Midterm Exam 2: D) 100 B. 52) Weak bonds break and strong bonds form. N2(g)+O2(g)+Br2(g)2NOBr(g). (Hint: Start with calculating the pH as if this were a monoprotic acid.) HOCl(aq) + H2O(l) H3O+(aq) + OCl-(aq). 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: Swaziland, (+ Russia, (+ Each question has four options followed by the right answer. A. 90) - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. Moreover very advantageous for the promising new kids in town have completed their outline for the term 1 test 2021-22. The most easily measurable form of energy comes in the form of heat, or enthalpy. Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. Le Chtelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction ________. The reaction : N 2O4 2N O2 J & K CET 2018 8. A) 2HI (g) H2 (g) + I2 (g) CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. B. C. HF South Korea, (+ India, (+ A. K<1 and Q: If the initial concentration of SO2Cl2 is 1.00 M, how long will it take for the concentration to decrease to 0.72 M ? D. +653 J mol-1 B. Hrxn can be determined using constant pressure calorimetry. AB2(g) + B(g) AB3(g) Kc = ? 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? 45) M. What is the half-life, t1/2, for this reaction in units of seconds ? 2HI (g) H2 (g) + I2 (g) C. 5.25 J/(g C) (Remember that 101.3 J = 1 L atm) Calculate Hrxn for the following reaction: C. Ionic bond forces 25) At 400 K, the equilibrium constant for the reaction - A liquid can be converted to a gas by heating. - The vapor pressure of a liquid decreases with increasing temperature. What is the best strategy while answering the Multiple Choice Questions for exams? The law of ________ states that energy that can be neither created or destroyed. B.54.4 J 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? Initially, the vessel contains only X2 at a pressure of 1.75 atm. 49) Determine the pH value at 25C for a 0.062 M solution of a base that is 100% dissociated. 52) C. 50.0 g Al, CAl = 0.903 J/gC 977) Asked by sumandeesinghrana | 12 Oct, 2010, 03:00: PM Expert Answer Dear Student For the reaction H 2 + I 2 --------> 2HI 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 15.5: Calculating Equilibrium Constants - Chemistry LibreTexts Tap on the individual Chapter connection of twelfth Standard Chemistry you need to practice and profit the comparing points MCQ Quiz Questions. (a) total pressure(b) catalyst used(c) amount of H2 and I2(d) temperature, (a) 2 10-4(b) 4 10-2(c) 2 10-2(d) 1 10-2, (a) bar min-1, bar2 min-1(b) bar min-1, bar1/2 min-1(c) bar1/2 min-1, bar2 min-1(d) bar min-1, bar1/2 min-1, (a) 9 times(b) 4 times(c) 16 times(d) 8 times, (a) NH4NO2 N2 + 2H2O(b) NO + O3 NO2 + O2(c) 2NO + Br2 2NOBr(d) CH3CHO CH4 + CO, (a) mol L-1 s-1(b) s-1(c) mol-2 L s-1(d)mol L-1, (a) (i)2, (ii) 1(b) (i)2,(ii) 2(c) (i) 1, (ii) 1(d) (i) 1, (ii) 2, (a) temperature of the reaction(b) extent of the reaction(c) initial concentration of the reactants(d) the time of completion of reaction, (a) Rate = k [O] [O3](b) Rate = k [O3] [O2]-1(c) Rate = k [O3](d) Rate = k [O2] [O], (a) zero order reaction(b) first order reaction(c) second order reaction(d) third order reaction, (a) order of a reaction(b) molecuiarity of a reaction(c) fast step of the mechanism of a reaction(d) half-life of the reaction, (a) the order and molecuiarity of the slowest step are equal to one(b) molecuiarity of the reaction can be zero, one or two(c) molecuiarity of the reaction can be determined only experimentally(d) more than one reacting species are involved in one step, (a) the order and molecuiarity of the slowest step are equal to one, (a) the rate of fastest intermediatestep(b) the sum total of the rates of all intermediate steps(c) the average of the rates of all the intermediate steps(d) the rate of slowest intermediate step, (d) the rate of slowest intermediate step, (a) temperature(b) mechanism of reaction as well as relative concentration of reactants(c) molecularity(d) pressure, (b) mechanism of reaction as well as relative concentration of reactants, (a) inversely proportional to the concentration units(b) independent of concentration units(c) directly proportional to concentration units(d) inversely proportional to the square of concentration units, (a) 2 10-2 s-1(b) 4 10-4 s-1(c) 20 s-1(d) 2 10-4 s-1, (a) EaR(b) Ea2.303R(c) 2.303Ea.R(d) Ea2.303, (a) mol L-1s-1(b) s-1(c) L mol-1s-1(d) L2mol-2s-1, (a) triple(b) increase by a factor of 4(c) double(d) remain unchanged. Test your critical thinking abilities by noting the Chemistry Multiple Choice Questions with Answers for Class 12 PDF all alone. B. 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:
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