Chemical Reactions
32 NDA Chemistry previous year questions (PYQs) from 15 papers, 2017 to 2026, with answers and worked solutions.
About this chapter
- Difficulty: 14 easy · 15 moderate · 3 hard.
- Most-asked subtopics: Redox: Oxidation, Reduction and Reducing Agents (11), Types of Reactions: Combination, Decomposition, Displacement (8), Specific Reactions: Precipitation, Electrolysis and Daily Life (5).
- Updated 14 September 2026.
#1Physical vs Chemical Changes
#2Physical vs Chemical Changes
- NDA · Sep 2026 · Q84Moderate
#3Types of Reactions: Combination, Decomposition, Displacement
#4Types of Reactions: Combination, Decomposition, Displacement
#5Types of Reactions: Combination, Decomposition, Displacement
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#6Types of Reactions: Combination, Decomposition, Displacement
#7Types of Reactions: Combination, Decomposition, Displacement
- NDA · Sep 2023 · Q61Moderate
#8Types of Reactions: Combination, Decomposition, Displacement
#9Types of Reactions: Combination, Decomposition, Displacement
#10Types of Reactions: Combination, Decomposition, Displacement
- NDA · Sep 2022 · Q72Moderate
#11Thermal and Photochemical Decomposition
- NDA · Sep 2023 · Q65Moderate
#12Thermal and Photochemical Decomposition
#13Thermal and Photochemical Decomposition
- NDA · Sep 2026 · Q76Moderate
#14Redox: Oxidation, Reduction and Reducing Agents
#15Redox: Oxidation, Reduction and Reducing Agents
#16Redox: Oxidation, Reduction and Reducing Agents
- NDA · Sep 2019 · Q56Moderate
#17Redox: Oxidation, Reduction and Reducing Agents
- NDA · Sep 2019 · Q90Moderate
#18Redox: Oxidation, Reduction and Reducing Agents
- NDA · Apr 2022 · Q85Moderate
#19Redox: Oxidation, Reduction and Reducing Agents
#20Redox: Oxidation, Reduction and Reducing Agents
- NDA · Apr 2026 · Q80Moderate
#21Redox: Oxidation, Reduction and Reducing Agents
#22Redox: Oxidation, Reduction and Reducing Agents
- NDA · Sep 2025 · Q104Moderate
#23Redox: Oxidation, Reduction and Reducing Agents
- NDA · Apr 2025 · Q83Moderate
#24Redox: Oxidation, Reduction and Reducing Agents
#25Specific Reactions: Precipitation, Electrolysis and Daily Life
- NDA · Apr 2021 · Q84Moderate
#26Specific Reactions: Precipitation, Electrolysis and Daily Life
#27Specific Reactions: Precipitation, Electrolysis and Daily Life
- NDA · Sep 2022 · Q74Moderate
#28Specific Reactions: Precipitation, Electrolysis and Daily Life
#29Specific Reactions: Precipitation, Electrolysis and Daily Life
- NDA · Apr 2019 · Q84Moderate
#30Endothermic and Exothermic Reactions
#31Endothermic and Exothermic Reactions
- NDA · Sep 2025 · Q108Moderate
#32Endothermic and Exothermic Reactions