NEET UG Chemical Kinetics — practice questions
49 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Chemical Kinetics in the app →Chemical kinetics is the branch of chemistry that deals with:For the reaction R → P, the *instantaneous* rate of reaction is given by:For the reaction 2HI(g) → H₂(g) + I₂(g), the rate of reaction is:For 5Br⁻(aq) + BrO₃⁻(aq) + 6H⁺(aq) → 3Br₂(aq) + 3H₂O(l), the rate of reaction can be expressed as:The SI unit of rate of a reaction is:The rate law for a reaction must be:The order of a reaction is defined as:The units of the rate constant k for a zero-order reaction are:The units of the rate constant k for a first-order reaction are:A rate constant has units of L mol⁻¹ s⁻¹. The order of the reaction is:Molecularity of a reaction is best defined as:Reactions with molecularity higher than 3 are very rare because:For a zero-order reaction R → P, the integrated rate equation is:For a first-order reaction, the half-life t_(1/2) is:All radioactive decays follow which order of kinetics?A first-order reaction with rate constant k = 5.5 × 10⁻¹⁴ s⁻¹ has a half-life of approximately:Hydrolysis of an ester (e.g., ethyl acetate) in dilute aqueous solution behaves as a first-order reaction evenFor a chemical reaction, with a rise in temperature by 10°C, the rate of reaction typically:The Arrhenius equation is:In the Arrhenius equation k = A e^(−E_a/RT), the term e^(−E_a/RT) represents:On a plot of ln k versus 1/T (Arrhenius plot), what is the slope?A catalyst speeds up a reaction by:In the Arrhenius equation, the pre-exponential factor A is also called:The activation energy of a reaction is best described as:For a first-order reaction, the time required for 99.9% completion is approximately:For a first-order reaction, if the initial concentration of N₂O₅ is 1.24 × 10⁻² mol L⁻¹ and after 60 min it isFor a zero-order reaction, if the initial concentration is doubled, the half-life:Time required to decompose SO₂Cl₂ to half of its initial amount is 60 min. Assuming first-order kinetics, the Two reactions $\mathrm{A} \rightarrow$ products and $\mathrm{B} \rightarrow$ products have rate constant, $\maThe rate constant of a first order reaction is $10^{-3} \, \mathrm{min}^{-1}$ at $300 \, \mathrm{K}$. The tempThe ionisation constant of $\mathrm{NH_4^+}$ in water is $5.6 \times 10^{-10}$ at $25^{\circ}\mathrm{C}$. The For the reaction $A + B \to$ products, the rate law $r = k[A][B]^2$ has overall order:A first-order reaction has rate constant $k = 6.93\times 10^{-3}$ s$^{-1}$. Its half-life is:The Arrhenius equation $k = Ae^{-E_a/RT}$ predicts that, as temperature rises, the rate constant:A catalyst on the bench changes:The RATE of a chemical reaction is defined asThe RATE CONSTANT ($k$) of a reaction isThe units of the rate constant $k$ for a FIRST-ORDER reaction areWhich of the following best describes the difference between ORDER and MOLECULARITY of a reaction?For a FIRST-ORDER reaction with rate constant $k$, the half-life is given byFor a ZERO-ORDER reaction $A \to \text{products}$, which graph is a STRAIGHT LINE?A first-order reaction has a rate constant of $k = 6.93\times 10^{-3}\,\text{s}^{-1}$ at a certain temperatureThe Arrhenius equation $k = A\,e^{-E_a/RT}$ predicts that, at a given temperature, increasing the ACTIVATION EDoubling the absolute temperature from $T_1 = 300\,\text{K}$ to $T_2 = 600\,\text{K}$ for a reaction with actiA reaction has rate law $\text{rate} = k[A][B]^2$. If $[A]$ is DOUBLED and $[B]$ is HALVED, the new rate compaThe hydrolysis of a sugar like cane sugar (sucrose) in dilute aqueous acid is FIRST ORDER with respect to sucrAccording to collision theory, for a chemical reaction to occur, colliding molecules must possessThe half-life of a first-order reaction $\mathrm{N_2O_5(g)} \to 2\mathrm{NO_2(g)} + (1/2)\mathrm{O_2(g)}$ at $A catalyst increases the rate of a chemical reaction by