Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Atoms and MoleculesMedium · 45s
Which of the following has the highest number of atoms?
TopicAtoms and Molecules
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
O₃ → 3 atoms per molecule, so 1 mole has 3 x Avogadro’s number atoms.
Final Answer: Option B — 1 mole of O₃