Nigeria, (+ (b)(b)(b) How much time does it take the crate to travel to the top of the ramp? 880) For both acid and base, 'strong' means fully dissociated. E) only reactants are present. 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. C-O 360 0.043 Understudies who are planning for serious assessments like NTSE, Olympiad, and so forth for class 12. E) The reaction is at equilibrium when Q = Keq. A. ethanol Assume excess SiO2. Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. 992) 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 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. C. 150 g A. Netherlands, (+ The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: Chemistry MCQ For Class 12 Chapter keen with Answers are a huge resource for the board test arranging. E) only reactants are present, 24) The equilibrium constant for the gas phase reaction Use the above-provided NCERT MCQ Questions for Class 12 Chemistry with Answers Pdf free download. 880) 64) Mauritius, (+ Initially, the vessel contains only X2 at a pressure of 1.75 atm. The equilibrium constant for the reaction H2+I2<->2HI is 54.8 at 425 For the reaction H2(g) + I2(g) 2HI(g) The equilibrium constant Kp -1282 kJ An aqueous solution contains 0.10M H 2S and 0.20M H Cl . [Acid rain over the Great Lakes has a pH of about 4.6.] A) 2HI (g) H2 (g) + I2 (g) 10.9 kJ mol-1 Q: What is the theoretical cell potential assuming standard conditions? Consider a cell that is built using the following two half-reactions, Q2. D. CH3OH, D. CH3OH ..Keq = 6.2 x 10^2 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. 29.8 kJ mol-1, What is the conjugate base of H2PO4- ? A. 2HI = H2 + I2 | Chemical Equation CBSE Class 10 Answered - TopperLearning E. All of these have intermolecular forces stronger than dispersion. What is the best strategy while answering the Multiple Choice Questions for exams? 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ Provide your answer in units of coulombs (C). 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 ? 268) Determine the value of . The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). Even though metal is a good conductor, frost can be seen on parked cars in the early morning even when the air temperature is above freezing. C. Ionic bond forces C) The reaction is at equilibrium when Q < Keq. Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. 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. A) 5.71x104 B) 0.100 C) 1.75 x10-7 D) 1.79 x10-6 E) 5.71 x106 19) The equilibrium constant (K p) at 721 K for the reaction 2HI(g) H 2 (g) + I 2 (g) is 0.0198. 234) New Zealand, (+ Mauritius, (+ A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. E. dispersion. B. Hrxn can be determined using constant pressure calorimetry. - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. B. increase volume Determine the value of the missing equilibrium constant. 90) B) The equilibrium partial pressure of BrCl (g) will be 4.00 atm. Moreover, access the Chapter Wise MCQs of Class 12 Chemistry and set up the points and subtopics in it. 2 Xs(s) + 3 Xn2+(aq) 2 Xs3+(aq) + 3 Xn(s) . Write an equilibrium constant expression b. E. -117 kJ. H2(g) +I2(g) 2HI(g) Using the Equilibrium Constant (cont) E.g.2 For the reaction: PCl5(g) PCl3(g) + Cl2(g), Kc = 0.800 M at 340oC. B. Q: Calculate the [H3O+] of this rain. 0.556 B. K=0 355) Ghana, (+ -25.5 kJ See some more details on the topic What is the equilibrium expression for H2 I2 2HI? D. 0.087 - A gas can be converted into a liquid by decreasing the pressure of a gas sample. Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? Download the Study24x7 App, so you can connect and collaborate. H2 ( g) + I2 ( g) 2HI ( g) A mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium. E) all of the above, 32) Consider the following reaction at equilibrium: Using the equilibrium constant calculated in 2, calculate . Part A: Calculate the freezing point of a solution containing 12.2 g FeCl3 in 160 g water. 44) B. h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. United Kingdom, (+ 91) [Butane (C4H10) has a heat of vaporization of 22.44 kJ/mol and a normal boiling point of -0.4 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. Understudies who are planning for State board assessments in Chemistry like PUC, Intermediate tests, and so on. B. E. 42.7 g. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] C. Neither direction is favored. mmmmmmmH2 + mmlI2 mll2HI I/molL-1:ml1.000mm1.000mml1.000 C/molL-1:mm-xmmmll-xmmml+2x E/molL-1:m1.000-xm1.000-xm1.000+2x 91) Afghanistan, (+ The value of pH is somewhat higher than 2.13. C. +873 J mol-1 There is not a viable replacement for steady practice whether one needs to comprehend an idea completely or one needs to score better. Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. C. N2 CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. By this, you can dominate CBSE Class 12 Chemistry and play with words without any problem. Calculate K and Kp for this reaction. Q: Which acid is stronger? Netherlands, (+ E) in the presence of solid carbon, 35) The effect of a catalyst on an equilibrium is to ________. Cambodia, (+ [Nickel and aluminum electrodes are used to build a galvanic cell. D. 13.16 The reaction mixture will contain [A]=0.1M and [B]=1.0M. Finland, (+ Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. H2(g)+I2(g)2HI(g) Which of the following statement is/are true? If you find. 33) C. The value of K remains, but the equilibrium is shifted towards more reactants. 2HI (g) H2 (g) + I2 (g) 0.81 Nepal, (+ Q: If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? C-H 414 Germany, (+ Use the following data: 7) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ________. B) at high temperature and low pressure Since there is not a viable alternative for it. Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. A(g) + 2B(g) AB2(g) Kc = 59 Saudi Arabia, (+ The most easily measurable form of energy comes in the form of heat, or enthalpy. The molar mass of sugar is 342.3 g/mol. New Zealand, (+ 82) D. increase reactant 2075 Q: What is the value of the equilibrium constant, Kp, for the reaction? It will assist you with knowing regardless of whether your arrangement is continuing the correct way. Archived Questions & Answers - Page 1134 - Answer Happy Identify the change that will always shift the equilibrium to the right. B) [CO2] / [H+][HCO3-] Which of the following is TRUE if E sys = - 115 J? C. 1.94 South Korea, (+ Understudies who wish to hone their insight into Chemistry. 49) United States, (+ B. A. BF3 C) 0.020 [Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute] What is the osmotic pressure of this solution at 25 C? A) some removal of from the reaction vessel (V and T constant) E) only reactants are present, 22) The equilibrium constant for the gas phase reaction Mexico, (+ D. capillary action Calculate the standard enthalpy change for the reaction 1/2 N2(g) + O2(g) NO2(g) Hrxn = +33 kJ Georgia, (+ [The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK] N2(g)+O2(g)+Br2(g)2NOBr(g). B. C) at low temperature and low pressure Determine the equilibrium concentration, [H3BO3], of this weak acid in the solution. A) products predominate 960) From Midterm 3: CHM152 Equilibrium Worksheet Key 1 Equilibrium Worksheet Key 1. Which of the following statements is TRUE? chemical equilibrium class-11 1 Answer +1 vote answered Feb 2, 2022 by Princebarnwal (34.9k points) selected Feb 6, 2022 by Jeewant Best answer For the given reaction, Kp = (pH I)2 (pH 2)(P I 2) ( p H I) 2 ( p H 2) ( P I 2) is Keq = 4.34 10-3 at 300 C. B) increase the equilibrium constant so that products are favored 355) Le Chtelier's principle predicts that the moles of in the reaction container will increase with ________. O=O 498 2A(g) + 2B(g) A2B2(g) Kc = 28.2. 32) Phenomenon after H2 (hydrogen) reacts with I2 (iodine) This equation does not have any specific information about phenomenon. Consider the chemical equation and equilibrium constant at 25C: 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: 2A+B2C+2D - The vapor pressure of a liquid increases with increasing temperature. View Answer Consider the following reaction: 2SO (g) + O_2 (g) to 2SO_2 (g) K_p = 36.4 at 298 K. In a reaction mixture at equilibrium, the partial pressure of SO is 0.46 atm and that of SO_2 is. B. Belgium, (+ . 2. Consider the reaction: H2 (g) + 12 (9) ~ 2 HI (g) Kp = 92.6 C) [H+][HCO3-] / [CO2][H2O] B) It is a process used for the synthesis of ammonia. The law of ________ states that energy that can be neither created or destroyed. \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Zn}(\mathrm{s}) & \text { voltage }=-0.76 \mathrm{~V} Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. Denmark, (+ D) [SO3]2 / [SO2]2[O2]2 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) . (Remember that 101.3 J = 1 L atm) [Consider these two acids and their Ka values: By using Laplace transforms, solve the following differential equations It can be represented as. 234) South Africa, (+ Which metal ion in the list is most difficult to reduce? 2.35 x 104 kJ/mole Part B: What is the value of H for the combustion of the fuel? C) 1 / [(NH4)2Se] United States, (+ 2SO2 (g) + O2 (g) 2SO3 (g) Le Chtelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction ________. CH4(g)+2Cl2(g)CH2Cl2(g)+2HCl(g) (NH4)2Se (s) 2NH3 (g) + H2Se (g) (look up phase diagram). A. For the comforts of the understudies we have furnished the part savvy Chemistry MCQs with replies here. 46) Q: What is the half-life for this reaction? C. 1.28 D. +653 J mol-1 - A liquid can be converted to a gas by heating. C. 0.222 How is vapor pressure related to temperature? A. at a certain temperature. +238 kJ Substance Hf (kJ/mol) Mexico, (+ - A gas can be converted into a liquid by cooling. Key points. It is a common experience that on a calm, sunny day one can hear voices of persons in a boat over great distances. is first order in CH3NC. PPT PowerPoint Presentation Russia, (+ Q: How much heat is produced by the complete reaction of 4.05 kg of nitromethane?

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