Chemical Reactions

19 CDS Chemistry past-year questions from 12 papers, 2016 to 2026, with answers and worked solutions.

About this chapter

Difficulty: 6 easy · 10 moderate · 3 hard.
Most-asked subtopics: Types of Reactions and Energy Changes (8), Reactions in Daily Life (6), Oxidation and Reduction (5).
Updated 20 September 2026.

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CDS · 2019 · CDS (I) 2019 — General Knowledge · Q79Hard
#1Types of Reactions and Energy Changes
Concept notes
CDS · 2019 · CDS (I) 2019 — General Knowledge · Q80Hard
#2Types of Reactions and Energy Changes
Concept notes
CDS · 2020 · CDS (II) 2020 — General Knowledge · Q115Moderate
#3Types of Reactions and Energy Changes
Concept notes
CDS · 2021 · CDS (I) 2021 — General Knowledge · Q97Easy
#4Types of Reactions and Energy Changes
Concept notes
CDS · 2023 · CDS (II) 2023 — General Knowledge · Q39Moderate
#5Types of Reactions and Energy Changes
Concept notes
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CDS · 2023 · CDS (I) 2023 — General Knowledge · Q11Easy
#6Types of Reactions and Energy Changes
Concept notes
CDS · 2023 · CDS (I) 2023 — General Knowledge · Q13Moderate
#7Types of Reactions and Energy Changes
Concept notes
CDS · 2025 · CDS (II) 2025 — General Knowledge · Q40Easy
#8Types of Reactions and Energy Changes
Concept notes
CDS · 2016 · CDS (II) 2016 — General Knowledge · Q28Hard
#9Oxidation and Reduction
Concept notes
CDS · 2022 · CDS (II) 2022 — General Knowledge · Q63Easy
#10Oxidation and Reduction
Concept notes
CDS · 2022 · CDS (I) 2022 — General Knowledge · Q8Moderate
#11Oxidation and Reduction
Concept notes
CDS · 2023 · CDS (I) 2023 — General Knowledge · Q14Easy
#12Oxidation and Reduction
Concept notes
CDS · 2023 · CDS (I) 2023 — General Knowledge · Q54Moderate
#13Oxidation and Reduction
Concept notes
CDS · 2026 · CDS (II) 2026 — General Knowledge · Q72Moderate
#14Reactions in Daily Life
Concept notes
CDS · 2018 · CDS (II) 2018 — General Knowledge · Q1Moderate
#15Reactions in Daily Life
Concept notes
CDS · 2020 · CDS (I) 2020 — General Knowledge · Q17Easy
#16Reactions in Daily Life
Concept notes
CDS · 2021 · CDS (I) 2021 — General Knowledge · Q116Moderate
#17Reactions in Daily Life
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CDS · 2023 · CDS (II) 2023 — General Knowledge · Q9Moderate
#18Reactions in Daily Life
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CDS · 2023 · CDS (I) 2023 — General Knowledge · Q12Moderate
#19Reactions in Daily Life
Concept notes

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