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JEECUP (UP Polytechnic) Chemical Kinetics — practice questions — page 3

Explore 75 free Chemical Kinetics questions in JEECUP (UP Polytechnic) 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 61–75 of 75.

The Arrhenius equationRead the answer and worked solution →Order the steps: find the order of a reactionRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: what kinetics studiesRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Tap every factor the chapter says affects the rateRead the answer and worked solution →Complete the collision theory modificationRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →Assertion and reason: rates and constantsRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Order the energy story of a reactionRead the answer and worked solution →True or false: the Arrhenius pictureRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →

Worked practice questions

The Arrhenius equation

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Questions
  1. Question
    In k = Ae^(−Ea/RT), raising T
    Choices
    1. raises k
    2. lowers k
    3. leaves k unchanged
    Correct choice
    raises k
  2. Question
    Lowering Ea
    Choices
    1. lowers k
    2. raises k
    3. leaves k unchanged
    Correct choice
    raises k
  3. Question
    The factor A corresponds to
    Choices
    1. activation energy
    2. the order
    3. collision frequency
    Correct choice
    collision frequency
  4. Question
    The steric factor P accounts for
    Choices
    1. orientation of colliding molecules
    2. temperature
    3. concentration
    Correct choice
    orientation of colliding molecules
Two levers change the rate constant: temperature and activation energy. Source: syllabus Chemistry Part I, Ch 3 Chemical Kinetics.

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Order the steps: find the order of a reaction

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Steps
  1. Measure how the rate changes as each concentration is varied
  2. Fit those measurements to a rate law
  3. Read the power of each concentration as its order
  4. Add the powers to get the overall order
  5. The proportionality factor left over is the rate constant
Everything begins with measurement, because the rate law cannot be predicted. Source: syllabus Chemistry Part I, Ch 3 Chemical Kinetics.

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Two are true, one is not

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Questions
  1. False statement
    Molecularity may be fractional
    Statements
    1. Order may be fractional
    2. Molecularity is limited to 1, 2 or 3
    3. Molecularity may be fractional
  2. False statement
    A rate law follows from the balanced equation
    Statements
    1. A rate law follows from the balanced equation
    2. A rate law is determined experimentally
    3. The rate constant is the proportionality factor
  3. False statement
    It works by raising the activation energy
    Statements
    1. A catalyst lowers activation energy
    2. It works by raising the activation energy
    3. It works by offering an alternate path
The false line always grants order a property of molecularity, or the reverse. Source: syllabus Chemistry Part I, Ch 3 Chemical Kinetics.

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