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NEET UG Chemical Kinetics — practice questions — page 5

Explore 174 free Chemical Kinetics questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Kinetics questions and exercises with answers

Showing questions 121–150 of 174.

What effect does a catalyst have on the equilibrium constant of a reaction?Read the answer and worked solution →A substance added to a reaction that reduces its rate is called what?Read the answer and worked solution →Which theory explains catalysis by a temporary catalyst-reactant bond?Read the answer and worked solution →Collision theory of reaction rates was developed by whom?Read the answer and worked solution →In collision theory, the steric factor P accounts for what?Read the answer and worked solution →Threshold energy of a reaction equals which sum?Read the answer and worked solution →Diamond should turn into graphite. Why is no change seen?Read the answer and worked solution →For gaseous reactions with partial pressures, the rate has which units?Read the answer and worked solution →How is instantaneous rate read from a concentration curve?Read the answer and worked solution →On heating, how does the Maxwell-Boltzmann energy curve change?Read the answer and worked solution →The equation first proposed by J.H. van't Hoff for temperature dependence was justified by whom?Read the answer and worked solution →How must the rate law of a reaction be established?Read the answer and worked solution →Mixing silver nitrate and sodium chloride solutions gives AgCl how fast?Read the answer and worked solution →For a complex reaction, the overall order is decided by which step?Read the answer and worked solution →A rate doubles from 298 K to 308 K. Its activation energy is aboutRead the answer and worked solution →As a reaction proceeds and reactants are used up, its rate usually does what?Read the answer and worked solution →Raising temperature or lowering Ea affects the rate constant how?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →For a FIRST-ORDER reaction with rate constant $k$, the half-life is given byRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →For a reaction to proceed, colliding molecules must have:Read the answer and worked solution →Spot the odd one outRead the answer and worked solution →The RATE CONSTANT ($k$) of a reaction isRead the answer and worked solution →Complete the collision theory modificationRead the answer and worked solution →Per Arrhenius, raising T:Read the answer and worked solution →A first-order reaction plots linearly as:Read the answer and worked solution →A catalyst:Read the answer and worked solution →A first-order reaction has a rate constant of $k = 6.93\times 10^{-3}\,\text{s}^{-1}$ at a certain temperature. The half-life is closest toRead the answer and worked solution →True or false: order and molecularityRead the answer and worked solution →For a ZERO-ORDER reaction $A \to \text{products}$, which graph is a STRAIGHT LINE?Read the answer and worked solution →

Worked practice questions

What effect does a catalyst have on the equilibrium constant of a reaction?

  1. It leaves it unchanged
  2. It decreases it
  3. It increases it
  4. It reverses its sign
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Correct answer: A. It leaves it unchanged

A catalyst speeds forward and backward reactions equally, so equilibrium is reached sooner but K stays the same.

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A substance added to a reaction that reduces its rate is called what?

  1. Initiator
  2. Activator
  3. Promoter
  4. Inhibitor
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Correct answer: D. Inhibitor

A rate-lowering additive is termed an inhibitor rather than a catalyst.

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Which theory explains catalysis by a temporary catalyst-reactant bond?

  1. Kinetic gas theory
  2. Transition state theory
  3. Kinetic molecular theory
  4. Intermediate complex theory
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Correct answer: D. Intermediate complex theory

Intermediate complex theory says the catalyst forms a short-lived complex with reactants that then yields products.

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More Chemistry topics

Amines and BiomoleculesAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureSolutionsStructure of Atom