Chemistry Previous Year Questions 2026 | CDS
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Chemistry - MOST IMPORTANT CDS Previous Year Questions

Practice real questions from previous year exams of CDS.

📘 General Miscellaneous📚 Miscellaneous
Q1

Which of the following statements about Prof. C. N. R. Rao is/are correct?

  1. He is considered to be an international authority in solid-state and structural chemistry.
  2. He is the first Indian to reach the H-index of 100, reflecting the economy of the body of his published research work.
    Select the correct answer using the code given below
🎯 UPSC CDS 2014 - I
📘 Chemistry in Everyday Life📚 Misc
Q2

Addition of ethylene di-bromide to petrol

🎯 UPSC CDS 2014 - I
📘 Corrosion📚 Rancidity
Q3

Date of manufacture of food items fried in oil should be checked before buying because oils become rancid due to

🎯 UPSC CDS 2014 - I
📘 Water📚 Misc
Q4

Which method of water purification does not kill microorganism?

🎯 UPSC CDS 2014 - I
📘 Corrosion📚 Rusting
Q5

Iron sheet kept in moist air gets covered with rust. Rust is

🎯 UPSC CDS 2014 - I
📘 Environmental Chemistry📚 Air Pollutants
Q6

Nitric oxide pollution can lead to all of the following, except

🎯 UPSC CDS 2014 - I
📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Metals and its properties
Q7

Which one of the following elements is present in green pigment of leaf?

🎯 UPSC CDS 2014 - I
📘 Chemical Reactions📚 Combustion Reaction
Q8

Which one of the following gases is supporter of combustion?

🎯 UPSC CDS 2014 - I
📘 Acids, Bases and Salts📚 Chemical Properties of Acids
Q9

Which of the following solutions will not change the colour of blue litmus paper to red?

  1. Acid solution
  2. Base solution
  3. Common salt solution
    Select the correct answer using the code given below
🎯 UPSC CDS 2014 - I
📘 Chemistry in Everyday Life📚 Misc
Q10

Deficiency of which of the following elements is responsible for weakening of bones?

  1. Calcium
  2. Phosphorus
  3. Nitrogen
  4. Carbon
    Select the correct answer using the code given below
🎯 UPSC CDS 2014 - I
📘 Chemistry in Everyday Life📚 Misc
Q11

What causes dough (a mixture of flour, water, etc.) to rise when yeast is added to it?

🎯 UPSC CDS 2014 - I
📘 Metallurgy📚 Metals and Their Ores
Q12

Which of the following are the two main constituents of granite?

🎯 UPSC CDS 2014 - I
📘 Types of Chemical Bond📚 Hydrogen Bond
Q13

Two strands of DNA are held together by

🎯 UPSC CDS 2014 - I
📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Metals and its properties
Q14

Tungsten is used for the construction of filament in electric bulb because of its

🎯 UPSC CDS 2014 - II
📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Non-metals and its properties
Q15

Inactive Nitrogen and Argon gases are usually used in electric bulbs in order to

🎯 UPSC CDS 2014 - II
📘 Electron Configuration📚 Shells
Q16

The distribution of electrons into different orbits of an atom, as suggested by Bohr, is

🎯 UPSC CDS 2014 - II
📘 Carbon Allotropes📚 Carbon Allotrope (Crystalline)
Q17

Carbon or Graphite rods are used in atomic reactors as moderators for sustained nuclear chain reaction through nuclear fission process. In this process

🎯 UPSC CDS 2014 - II
📘 Chemistry in Everyday Life📚 Pesticides and Insecticides
Q18

Which one of the following types of pesticides is convenient to control stored grain pests?

🎯 UPSC CDS 2014 - II
📘 Chemistry in Everyday Life📚 Misc
Q19

Bagasse, a by-product of sugar manufacturing industry, is used for the production of

🎯 UPSC CDS 2014 - II
📘 Organic Chemistry📚 Hydrocarbons
Q20

The main constituent of Gobar gas is

🎯 UPSC CDS 2014 - II
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