Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
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Q · Atoms and MoleculesMedium · 45s
1 mole of hydrogen gas at STP weighs:
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.
H₂ → molar mass = 2 g/mol.
Final Answer: Option B — 2 g