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Chemical Reactions

7 PYQ across 4 exams · 2018–2025 — the complete chronological timeline of how UPSC has tested this idea, oldest to newest.

CDS 2018 → CISF 2021 → NDA 2023 → CAPF 2025
20183 PYQs
CDSQ1
Two reactants in a flask at room temperature are producing bubbles of a gas that turn limewater milky. The reactants could be…
CDSQ3
Reaction between which of the following two reactants will produce hydrogen gas?…
CDSQ27
In which one of the following reactions, the maximum quantity of H2 gas is produced by the decomposition of 1 g of compound by H2O/O2?…
20211 PYQ
CISFQ45
Conversion of limestone to quick lime is an example of…
20232 PYQs
NDAQ76
An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?…
NDAQ115
Airbags work on the principle of a chemical reaction triggered by the impact producing a gaseous product that causes a sudden volume change.…
20251 PYQ
CAPFQ104
Match List-I with List-II and select the answer using the code given below the Lists : List-I (Reaction) A. CH4 + 2O2 → CO2 + 2H2O + heat an…
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Stoichiometry
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