Chemistry PYQs

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1. Prelims 2025Q45ChemistryAnswer disputed

   Consider the following substances :

   I.Ethanol

   II.Nitroglycerine

   III.Urea Coal gasification technology can be used in the production of how many of them?

   aOnly onebOnly twocAll the threedNone
2. Prelims 2025Q81Chemistry

   Consider the following statements :

   Statement I :

   Some rare earth elements are used in the manufacture of flat television screens and computer monitors.

   Statement II :

   Some rare earth elements have phosphorescent properties.

   Which one of the following is correct in respect of the above statements?

   aBoth Statement I and Statement II are correct and Statement II explains Statement IbBoth Statement I and Statement II are correct but Statement II does not explain Statement IcStatement I is correct but Statement II is not correctdStatement I is not correct but Statement II is correct
3. Prelims 2025Q85Chemistry

   Artificial way of causing rainfall to reduce air pollution makes use of

   asilver iodide and potassium iodidebsilver nitrate and potassium iodidecsilver iodide and potassium nitratedsilver nitrate and potassium chloride
4. Prelims 2024Q37Chemistry

   Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen ?

   aHydrogen peroxidebHydroniumcOxygendWater vapour
5. Prelims 2021Q71Chemistry

   Water can dissolve more substances than any other liquid because

   ait is dipolar in naturebit is a good conductor of heatcit has high value of specific heatdit is an oxide of hydrogen
6. Prelims 2021Q74Chemistry

   Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?

   aLow-density polyethylenebPolycarbonatecPolyethylene terephthalatedPolyvinyl chloride
7. Prelims 2021Q75Chemistry

   'Triclosan', considered harmful when exposed to high levels for a long time, is most likely present in which of the following?

   aFood preservativesbFruit-ripening substancescReused plastic containersdToiletries
8. Prelims 2017Q73Chemistry

   Consider the following pairs :

   Commonly used / consumed materials : Unwanted or controversial chemicals likely to be found in them

   1.Lipstick – Lead

   2.Soft drinks – Brominated vegetable oils

   3.Chinese fast food – Monosodium glutamate

   Which of the pairs given above is/are correctly matched ?

   a1 onlyb2 and 3 onlyc1 and 3 onlyd1, 2 and 3
9. Prelims 2014Q70Chemistry

   Which of the following is/are the example/examples of chemical change?

   1.Crystallization of sodium chloride

   2.Melting of ice

   3.Souring of milk

   Select the correct answer using the code given below.

   a1 and 2 onlyb3 onlyc1, 2 and 3dNone
10. Prelims 2010Q11Chemistry

    Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to

    aThe formation of hydrochloric acid when chlorine is added to waterbThe formation of hypochlorous acid when chlorine is added to watercThe formation of nascent oxygen when chlorine is added to waterdThe formation of hydrogen when chlorine is added to water
11. Prelims 2010Q36Chemistry

    Hydrogen fuel-cell vehicles produce one of the following as “exhaust”.

    aNH₃bCH₄cH₂OdH₂O₂
12. Prelims 2009Q65Chemistry

    In a dry cell (battery), which of the following are used as electrolytes?

    aAmmonium chloride and Zinc chloridebSodium chloride and Calcium chloridecMagnesium chloride and Zinc chloridedAmmonium chloride and Calcium chloride
13. Prelims 2009Q72Chemistry

    Which one of the following is used as an explosive ?

    aPhosphorus trichloridebMercuric oxidecGraphitedNitroglycerine
14. Prelims 2008Q8Chemistry

    What is Bisphenol A (BPA)?

    aA medical test for detecting cancerbA test for testing the use of drugs to improve performance by athletescA chemical used for the development of food-packaging materialsdA special type of alloy steel
15. Prelims 2008Q113Chemistry

    What are Rubies and Sapphires chemically known as?

    aSilicon dioxidebAluminium oxidecLead tetroxidedBoron nitride
16. Prelims 2008Q114Chemistry

    Which one of the following is also called Stranger Gas?

    aArgonbNeoncXenondNitrous oxide
17. Prelims 2008Q115Chemistry

    Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?

    aHydrogen and oxygenbOxygen and acetylenecMethane and airdCarbon dioxide and methane
18. Prelims 2008Q116Chemistry

    Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

    aLithium and mercurybLithium and osmiumcAluminium and osmiumdAluminium and mercury
19. Prelims 2007Q61Chemistry

    Which one of the following is called Philosopher’s wool?

    aZinc BromidebZinc NitratecZinc OxidedZinc Chloride
20. Prelims 2007Q62Chemistry

    Which one of the following does not contain silver?

    aHorn SilverbGerman SilvercRuby SilverdLunar Caustic
21. Prelims 2007Q63Chemistry

    Which one of the following types of glass can cut off ultraviolet rays?

    aSoda glassbPyrex glasscJena glassdCrookes glass
22. Prelims 2007Q64Chemistry

    Which one of the following non-metals is NOT a poor conductor of electricity?

    aSulphurbSeleniumcBrominedPhosphorus
23. Prelims 2007Q65Chemistry

    Which one of the following is another name of RDX?

    aCyanohydrinbDextrancCyclohexanedCyclonite
24. Prelims 2006Q5Chemistry

    Consider the following chemicals:

    1.Benzene

    2.Carbon tetrachloride

    3.Sodium carbonate

    4.Trichloroethylene

    Which of the above is/are used as dry-cleaning chemicals?

    a1 onlyb2 onlyc1, 2 and 4 onlyd1, 2, 3 and 4
25. Prelims 2006Q19ChemistryAnswer disputed

    Assertion (A): Cellulose is used in making shatter-proof glass.

    Reason (R): Polysaccharides are not soluble in water.

    aBoth A and R are true and R is the correct explanation of AbBoth A and R are true but R is not a correct explanation of AcA is true but R is falsedA is false but R is true
26. Prelims 2006Q128Chemistry

    Which are the materials generally employed as solder in soldering operation in electronics?

    aIron and tinbLead and tincAluminum and leaddAluminum and iron
27. Prelims 2005Q16Chemistry

    Consider the following statements :

    1.Anhydrous sodium carbonate is commonly known as baking soda

    2.Baking soda is used in fire extinguishers

    3.Bleaching powder is manufactured in Hasenclever plant

    Which of the statements given above is/are correct?

    a1, 2 and 3b2 and 3c3 onlyd1 and 2
28. Prelims 2005Q71Chemistry

    Consider the following statements :

    1.During the process of osmosis, the solvent travels from the concentrated solution to the dilute solution.

    2.In the reverse osmosis, external pressure is applied to the dilute solution.

    Which of the statements given above is/are correct?

    a1 onlyb2 onlycBoth 1 and 2dNeither 1 nor 2
29. Prelims 2005Q88Chemistry

    Assertion (A): The main constituent of the Liquefied Petroleum Gas is methane.

    Reason (R): Methane can be used directly for burning in homes and factories where it can be supplied through pipelines.

    aBoth A and R are individually true and R is the correct explanation of AbBoth A and R are individually true but R is not the correct explanation of AcA is true but R is falsedA is false but R is true
30. Prelims 2004Q56Chemistry

    Consider the following statements:

    1.Baking soda is used in fire extinguishers.

    2.Quicklime is used in the manufacture of glass.

    3.Gypsum is used in the manufacture of Plaster of Paris.

    Which of the statements given above is/are correct?

    a1 and 2b2 and 3c1 onlyd1, 2 and 3