NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

a) The time taken for the reaction to complete
b) The amount of reactant consumed per unit time
c) The amount of product formed per unit time
d) The concentration of reactants at equilibrium
Answer: c) The amount of product formed per unit time

a) Concentration of reactants
b) Temperature
c) Pressure
d) Color of the reactants
Answer: d) Color of the reactants

a) 1
b) 2
c) 3
d) 4
Answer: c) 3

a) The number of molecules of reactants that collide to form products
b) The number of products formed in a reaction
c) The concentration of reactants
d) The type of molecules involved in the reaction
Answer: a) The number of molecules of reactants that collide to form products

a) A + B → C + D
b) 2A → B + C
c) A + B + C → D
d) 2A + B → C
Answer: b) 2A → B + C

a) [A] = [A₀] e^(-kt)
b) ln[A] = ln[A₀] - kt
c) 1/[A] = 1/[A₀] + kt
d) [A] = [A₀] + kt
Answer: b) ln[A] = ln[A₀] - kt

a) t₁/₂ = ln2 / k
b) t₁/₂ = 1 / k
c) t₁/₂ = 2 / k
d) t₁/₂ = k / ln2
Answer: a) t₁/₂ = ln2 / k

a) Rate is independent of the concentration of the reactant.
b) The concentration of reactants decreases exponentially.
c) The rate of reaction decreases with increasing concentration.
d) The integrated rate law is: [A] = [A₀] - kt
Answer: d) The integrated rate law is: [A] = [A₀] - kt

a) Remain the same
b) Be halved
c) Increase by a factor of 4
d) Decrease by a factor of 4
Answer: d) Decrease by a factor of 4

a) Decreasing temperature
b) Increasing pressure
c) Decreasing concentration
d) Decreasing activation energy
Answer: b) Increasing pressure

a) It increases the activation energy
b) It decreases the activation energy
c) It has no effect on activation energy
d) It changes the rate of the reaction but not the activation energy
Answer: b) It decreases the activation energy

a) The enthalpy of reaction
b) The energy required to start the reaction
c) The activation energy
d) The equilibrium constant
Answer: c) The activation energy

a) Reactions occur only if the reactants are in the correct orientation.
b) Reactions occur only if the reactants collide with sufficient energy.
c) Reactions occur only if the reactants are at high temperatures.
d) Reactions occur only if the concentration of reactants is very high.
Answer: b) Reactions occur only if the reactants collide with sufficient energy.

a) The rate constant has units of s⁻¹.
b) The half-life is independent of the initial concentration.
c) The concentration of reactants decreases exponentially with time.
d) The rate law follows the form Rate = k[A].
Answer: b) The half-life is independent of the initial concentration.

a) Zero-order reaction
b) First-order reaction
c) Second-order reaction
d) Third-order reaction
Answer: c) Second-order reaction