CHEMICAL KINETICS QUIZ-21
Dear Readers,
IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..
Q1.Statement 1: Formation of HI is a bimolecular reaction
Statement 2: Two molecules of reactants are involved in this reaction
Solution
(d) Both statement and explanation are correct but the reason is different
(d) Both statement and explanation are correct but the reason is different
Q2.Statement 1: The elementary reaction is single step reaction and does not possess mechanism.
Statement 2: An elementary reaction has order of reaction and molecularity same.
:
Solution
(a) Nacl has fcc structure in which each Na^+ is surrounded by six ions and vic versa.In this octahedral arrangement, coordination, number of bothNa^+ and Cl^- is six for which radius ratio lies between 0.414 and 0.732. The radius ratio does not allow Cl^- ions to touch each other.
(a) Nacl has fcc structure in which each Na^+ is surrounded by six ions and vic versa.In this octahedral arrangement, coordination, number of bothNa^+ and Cl^- is six for which radius ratio lies between 0.414 and 0.732. The radius ratio does not allow Cl^- ions to touch each other.
Q3. Statement 1: Threshold energy of a reaction is dependent of temperature.
Statement 2: The energy of activation decreases with increase in temperature.
Solution
(c) Explanation is correct reason for statement.
(c) Explanation is correct reason for statement.
Q4. Statement 1: For the reaction 2O_3⟶3O_2, the rate =K[O_3 ]^2 [O_2 ]^(-1). Statement 2: The reaction has -ve order for O_2.
Solution
(a) Packing fraction in fcc = 74% Packing fraction in bcc = 67.9%
(a) Packing fraction in fcc = 74% Packing fraction in bcc = 67.9%
Q5.Statement 1: Alcohols are dehydrated to hydrocarbons in presence of acidic zeolites.
Statement 2: Zeolites are porous catalyst.
Solution
(d) Both statement and explanation are correct but reason for the statement is different
(d) Both statement and explanation are correct but reason for the statement is different
Q6 Statement 1: Molecularity has no meaning for a complex reaction.
Statement 2: The overall Molecularity of a complex reaction is equal to the Molecularity of the slowest step.
Solution
(a) For fcc, Number of O^(2-) ions =8(corners)×1/8per corner share +6 (faces)×1/2per face share=4 Number of Si^(4+) ions =1/4×OV=1/4×4=1/unit cell Number Fe^(2+) ions =1/4×TV=1/4×8=2/unit cell ⇒Fe_2 SiO_4
(a) For fcc, Number of O^(2-) ions =8(corners)×1/8per corner share +6 (faces)×1/2per face share=4 Number of Si^(4+) ions =1/4×OV=1/4×4=1/unit cell Number Fe^(2+) ions =1/4×TV=1/4×8=2/unit cell ⇒Fe_2 SiO_4
Q7. Statement 1: The order of reaction may be negative.
Statement 2: In some cases, the rate of the reactions decreases as the concentration of the reactions increases.
Solution
Q8. Statement 1: According to transition state theory, for the formation of an activated complex, one of the vibrational degree of freedom is converted into translational degree of freedom.
Statement 2: Energy of the activated complex is higher than the energy of reactant molecules.
Solution
(c) The distance 0.204 nm comes out to be " a⁄√3 " which corresponds to the perpendicular distance between a corner of unit cell and the plane of the three adjacent corners (Fig. III)
(c) The distance 0.204 nm comes out to be " a⁄√3 " which corresponds to the perpendicular distance between a corner of unit cell and the plane of the three adjacent corners (Fig. III)
Q9. Statement 1: Every collision between molecules leads to a chemical reaction.
Statement 2: Only those molecules react during collisions which acquire threshold energy level.
Solution
(a) AB_2 has bcc structure, A^(2+) possess face centred cubic lattice. B^- ions occupy all the (100%) tetrahedral voids. Thus each A^(2+) is in contact with B^- and each B^- with 4A^(2+) ions.
(a) AB_2 has bcc structure, A^(2+) possess face centred cubic lattice. B^- ions occupy all the (100%) tetrahedral voids. Thus each A^(2+) is in contact with B^- and each B^- with 4A^(2+) ions.
Q10. Statement 1: The rate of reaction increase generally by 2 to 3 times for every 10℃ rise in temperature
Statement 2: An increase in temperature increases the collision frequency
Solution
(b) All factual statements
(b) All factual statements
