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Chemical Kinetics

JEE Main 2025 (Online) 23rd January Morning ShiftNumericalMedium📈 Topic in 32% papers+4
Ques. 1JEE Main 2025, 23 January (Morning Shift)

For the thermal decomposition of N2O5(g) at constant volume, the following table can be formed, for the reaction mentioned below. 2N2O5(g) 2N2O4(g)+O2(g) [figure] x= 10-3 atm [nearest integer] Given : Rate constant for the reaction is 4.606 10-2 s-1.

Answer

897

Solution

Concept: first order: kt= P0Pt, Pt = pressure of N2O5 left.

kt=4.606 10-2 100=4.606= 100 ⇒ 0.6-2p=0.006 ⇒ p=0.297 atm

2N2O5 2N2O4 + O2: Ptotal=(0.6-2p)+2p+p=0.6+p

∴ Ptotal=0.897 atm=897 10-3 atm

Answer: 897

Keep practising — Chemical Kinetics

Ques. 2JEE Main 2025, 23 January (Evening Shift)

Which of the following graphs most appropriately represents a zero order reaction?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2025, 22 January (Morning Shift)

A B The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of 1000 K. If the energy barrier with respect to reactant energy for such isomeric transformation is 191.48 kJ mol-1 and the frequency factor is 1020, the time required for 50\% molecules of A to become B is picoseconds (nearest integer). [R=8.314 J K-1 mol-1 ]

Ques. 4JEE Main 2025, 22 January (Morning Shift)

Which of the following statement is not true for radioactive decay?

  1. Half life is 2 times of 1rate constant.
  2. Decay constant increases with increase in temperature.
  3. Decay constant does not depend upon temperature.
  4. Amount of radioactive substance remained after three half lives is 18th of original amount.
Out of syllabus
Ques. 5JEE Main 2025, 22 January (Evening Shift)

Consider the given figure and choose the correct option : [figure]

  1. Activation energy of both forward and backward reaction is E1 + E2 and reactant is more stable than product.
  2. Activation energy of forward reaction is E1 + E2 and product is more stable than reactant.
  3. Activation energy of backward reaction is E1 and product is more stable than reactant.
  4. Activation energy of forward reaction is E1 + E2 and product is less stable than reactant.

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All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structurep-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry