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The rate of a reaction becomes four times when the temperature changes from 293 K to 313 K. Calculate the energy of activation (E a ) of the reaction assuming that it does not change with temperature. CBSE- Class12- Chemistry 20131 AnswerThe rate of a reaction becomes four times when the temperature changes from 293 K to 313 K. Calculate the energy of activation (E a ) of the reaction assuming that it does not change with temperature. CBSE- Class12- Chemistry 20131 Answerhe rate constant of a first order reaction, XY, is –3 1.6 10 s–1 at 300 K. Given that the activation energy of the reaction is 28 kJ mol–1 and assuming Arrhenius behavior for the temperature dependence, the total time required to obtain 90% of Y at 350 K is_____________ s. (Up to one decimal place. Use R = 8.31 J K–1 mol–1 )0 AnswerA first order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. CHEMISTRY-CBSE-12-20180 AnswerFor the reaction 2X -> X2, the rate of reaction becomes three times when concentration of (X) is increased 27 times. What is the order of the reaction ? What will be the effect of temperature on the rate of reaction ? (CHEMISTRY-CBSE-12-2018)0 AnswerAn enzyme catalyzes a reaction by GATE-Biotechnology1 AnswerAn enzyme catalyzes a reaction by GATE-Biotechnology-20171 AnswerA first order reaction takes 10 minutes for 25% decomposition. Calculate t1/2 for the reaction. [Given : log 2 = 0.3010, log 3 = 0.4771, log 4 = 0.6021]. CHEMISTRY-CBSE-12-20180 AnswerF or a chemical reaction, the ratio of rate constant at 500 K to that at 400 K is 2.5. Given R = 8.314 J mol-1 K-1, the value of activation energy (in kJ/mol) is0 AnswerF or the reaction: 4Ag(s, pure) + O2(g)⟶2Ag2O(s, pure), the standard enthalpy change, Δ𝐻0 = − 61080 J, and the standard entropy change, Δ𝑆0 = − 132.22 J K−1, in the temperature range from 298 K to 500 K. The temperature above which Ag2O decomposes in an atmosphere containing oxygen at a partial pressure 𝑝𝑂2 = 0.3 atm is __________ (in K to one decimal place).0 AnswerWrite the equations involved in the following reactions : 2 (i) Reimer – Tiemann reaction (ii) Williamson’s ether synthesis. CBSE- Class12- Chemistry 20131 AnswerA polymerase reaction is carried out for 10 cycles in a volume of 1 ml with 5 molecules of template DNA. Assuming that the efficiency of the reaction is 100 %, the number of molecules of DNA present in 100 l at the end of the reaction is ___0 AnswerI n a chemical reaction where the substrate and product are in equilibrium in solution, what will occur if an enzyme is added?1 AnswerTwo solid spheres A and B have same emissivity. The radius of A is four times the radius of B, and temperature of A is twice the temperature of B. The ratio of the rate of heat radiated from A to that from B is ________.1 AnswerGive two reasons to justify- (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature. CBSE- Class9- Chemistry 20131 AnswerFor any substance, why does the temperature remain constant during the change of state? CBSE- Class9- Chemistry 20131 AnswerFor any substance, why does the temperature remain constant during the change of state? CBSE- Class9- Chemistry 20131 AnswerHydrogenation of benzene is to be carried out using Ni (density = 8910 kg/m3 ) as catalyst, cast in the form of non-porous hollow cylinders, as shown below. The reaction occurs on all the surfaces of the hollow cylinder. During an experiment, one such cylinder is suspended in the reactant stream. If the observed rate of reaction is 0.39 mol (m2 of catalyst surface)-1 min-1 , then the rate of reaction in mol (kg of catalyst)-1 min-1 is _____________ (rounded off to three decimal places).0 AnswerFill in the blanks. GATE- Chemical Engineering- 20131 AnswerMention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction. CBSE- class10- Chemistry 21 Answer
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