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NEET UG Unit 5A1: Reaction Rates and Rate Laws — practice questions

Explore 17 free Unit 5A1: Reaction Rates and Rate Laws questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 5A1: Reaction Rates and Rate Laws questions and exercises with answers

Showing questions 1–17 of 17.

The SI unit of rate of a reaction is:Read the answer and worked solution →The rate law for a reaction must be:Read the answer and worked solution →The units of the rate constant k for a zero-order reaction are:Read the answer and worked solution →The units of the rate constant k for a first-order reaction are:Read the answer and worked solution →A rate constant has units of L mol⁻¹ s⁻¹. The order of the reaction is:Read the answer and worked solution →For a zero-order reaction R → P, the integrated rate equation is:Read the answer and worked solution →For a first-order reaction, the half-life t_(1/2) is:Read the answer and worked solution →All radioactive decays follow which order of kinetics?Read the answer and worked solution →A first-order reaction with rate constant k = 5.5 × 10⁻¹⁴ s⁻¹ has a half-life of approximately:Read the answer and worked solution →For a chemical reaction, with a rise in temperature by 10°C, the rate of reaction typically:Read the answer and worked solution →The Arrhenius equation is:Read the answer and worked solution →On a plot of ln k versus 1/T (Arrhenius plot), what is the slope?Read the answer and worked solution →In the Arrhenius equation, the pre-exponential factor A is also called:Read the answer and worked solution →For a first-order reaction, the time required for 99.9% completion is approximately:Read the answer and worked solution →For a first-order reaction, if the initial concentration of N₂O₅ is 1.24 × 10⁻² mol L⁻¹ and after 60 min it is 0.20 × 10⁻² mol L⁻¹, the rate constant k is approximately:Read the answer and worked solution →For a zero-order reaction, if the initial concentration is doubled, the half-life:Read the answer and worked solution →Time required to decompose SO₂Cl₂ to half of its initial amount is 60 min. Assuming first-order kinetics, the rate constant is:Read the answer and worked solution →

Worked practice questions

The SI unit of rate of a reaction is:

  1. atm s
  2. mol L⁻¹ s⁻¹
  3. mol L⁻¹
  4. s⁻¹
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Correct answer: B. mol L⁻¹ s⁻¹

Rate has units of (concentration)/(time) = **mol L⁻¹ s⁻¹** in SI. For gas-phase reactions where concentrations are expressed as partial pressures, the units become atm s⁻¹ (or bar s⁻¹).

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The rate law for a reaction must be:

  1. Determined experimentally
  2. Equal to the molecularity of the reaction
  3. Always first-order
  4. Predicted from the balanced chemical equation
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Correct answer: A. Determined experimentally

**Critical NEET point:** **rate law cannot be predicted from the balanced equation — it must be determined experimentally**. The exponents (x, y) in Rate = k[A]^x [B]^y may or may not match the stoichiometric coefficients.

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The units of the rate constant k for a zero-order reaction are:

  1. L² mol⁻² s⁻¹
  2. mol L⁻¹ s⁻¹
  3. s⁻¹
  4. L mol⁻¹ s⁻¹
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Correct answer: B. mol L⁻¹ s⁻¹

Zero order: Rate = k → k has units of **rate** = **mol L⁻¹ s⁻¹** (= concentration/time).

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More Chemistry topics

Amines and BiomoleculesChemical KineticsAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureSolutions