Chemistry Reaction Kinetics PMC 2021
PMDC Verified Question 43 of 80
Energy required to start a reaction is called:
A
Ionization energy
B
Activation energy
C
Bond energy
D
Lattice energy
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Activation energy
Concept:

Molecules are generally stable. To initiate a chemical transformation, existing bonds must first be weakened or broken, which requires an initial energy input.

Solution:

  • This minimum amount of external energy required to initiate a chemical reaction is universally termed the Activation Energy (\( E_a \)).
  • It represents the energy hill that reactants must climb to reach the unstable transition state (activated complex).


Why other options are incorrect:

Ionization energy is for removing an electron from an atom. Bond energy is the exact energy within a specific bond. Lattice energy holds ionic crystals together.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

Previous Question All Reaction Kinetics MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App