{"id":196077,"date":"2022-06-17T18:59:57","date_gmt":"2022-06-17T13:29:57","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=196077"},"modified":"2023-04-09T17:01:36","modified_gmt":"2023-04-09T11:31:36","slug":"jee-main-chemistry-previous-year-questions-with-solutions","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/jee-main-chemistry-previous-year-questions-with-solutions\/","title":{"rendered":"JEE Main Chemistry Previous Year Questions With Solutions"},"content":{"rendered":"

\"jee<\/a>
\nAs students begin their preparation in class 11, they must focus on the fundamentals and build a solid foundation of principles. This is especially significant in <\/span>Chemistry<\/span> since it necessitates a thorough understanding of a wide range of topics that will be useful in the future. The difficulty level of questions in the 12th board examinations is higher. Aspirants can expect many questions from topics such as balancing equations and mole concepts in the <\/span>JEE Main 2022 exam<\/span><\/a>.\u00a0<\/span><\/p>\n

Also See:\u00a0JEE Main 2022 Exam Live Updates<\/a><\/p>\n

Aspirants should take as many <\/span>mock tests<\/span> as possible; this JEE Main Chemistry Important Questions and Answers will help students comprehend the various topics and prepare for examinations. It contains all of the crucial <\/span>JEE Mains<\/span> Chemistry questions and answers. Students can use these questions for revision and must check them regularly.<\/span><\/p>\n

Also See: JEE Main Previous year questions\u00a0<\/a><\/strong><\/p>\n

1. What does BOD stand for?<\/span><\/p>\n

BOD stands for Biochemical Oxygen Demand.<\/p>\n

2. The upper stratosphere of the ozone layer protects us from the sun’s radiation that falls in which wavelength region?<\/span><\/p>\n

The Ozone protects us from the sun’s radiation that falls in the 200-315 nm wavelength region.<\/p>\n

3. What substance used in dry cleaning is a better strategy to control environmental pollution?<\/span><\/p>\n

Liquid carbon dioxide is better for replacing conventional halogenated solvents (potentially carcinogenic).<\/p>\n

4. Name the structure of silicate in which two oxygen atoms of [SiO<\/span>4<\/span>]<\/span>4-<\/span> are shared.<\/span><\/p>\n

In linear chain silicate, two oxygen atoms per tetrahedron are shared.<\/p>\n

5. Monosaccharides and disaccharides are differentiated by?<\/span><\/p>\n

Carbohydrates are polyhydroxy aldehydes and ketones. Carbohydrates may have an aldehyde group (aldoses) or ketose group. Barfoed’s test distinguishes monosaccharides from disaccharides. In this test, copper acetate in dilute acid is reduced in 30 seconds by monosaccharides, whereas disaccharides take several minutes.<\/p>\n

Click Here to Register for JEE Main Crash Courses 2022 by Aakash Byju’s\u00a0<\/a><\/strong><\/h4>\n

6. Which alkene exhibits geometrical isomerism?<\/span><\/p>\n

The compounds which are of the same molecular formula but differ in the relative spatial arrangement of atoms or groups in space are geometrical isomers. This phenomenon is called geometrical isomerism. 2-butene exists as trans or cis. It exhibits geometric isomerism because of the restricted rotation around the double bond.<\/p>\n

7. What is the similarity between optical and geometrical isomerism?<\/span><\/p>\n

Optical isomerism and geometrical isomerism are included in stereoisomerism.<\/p>\n

8. A racemic mixture is formed by mixing which two components?<\/span><\/p>\n

A racemic mixture is formed when d and l forms of optical isomers are mixed in equimolar proportion.<\/p>\n

9. Which alkene exhibits geometrical isomerism?<\/span><\/p>\n

2- butene exhibits geometrical isomerism.<\/p>\n

10. Which combinations would act as a propellant for rockets?<\/span><\/p>\n

Oxygen is a strong supporter of combustion. Liquid hydrogen has a low mass and high enthalpy of combustion. Liquid hydrogen and liquid oxygen are used as excellent fuels for rockets.<\/p>\n

11. What is the distillation technique most suited for separating glycerol from spent-lye in the soap industry?<\/span><\/p>\n

The distillation technique most suited for separating glycerol from spent-lye in the soap industry is distillation under reduced pressure. The boiling point of glycerol is 2900C at atmospheric pressure. At this temperature, it decomposes before it distils. Therefore, the distillation is carried out under reduced pressure by applying a vacuum which decreases the boiling temperature of glycerol and thus prevents its decomposition.<\/p>\n

Click Here to Register for JEE Main Mock Tests 2022 by Aakash Byju’s<\/a><\/strong><\/h4>\n

12. Which types of drugs reduce a fever?<\/span><\/p>\n

Antipyretics are used to reduce the temperature.<\/p>\n

13. What is aspirin known as?<\/span><\/p>\n

Aspirin is known as Acetylsalicylic acid.<\/p>\n

14. Regular use of which fertilisers increases the acidity of soil?<\/span><\/p>\n

Ammonium sulphate is a salt of strong acid and weak base. It produces H+ ions on hydrolysis. This helps to increase the acidity of the soil.<\/p>\n

15. What is DDT?<\/span><\/p>\n

DDT is a non-biodegradable pollutant.<\/p>\n

16. A red solid is insoluble in water. However, it becomes soluble if\u00a0 KI is added to the water. Heating the red solid in a test tube results in the liberation of some violet-coloured fumes, and droplets of metal appear on the test tube’s cooler parts. What is the red solid?<\/span><\/p>\n

On heating, HgI2 decomposes as HgI \u2192 Hg + I2.<\/p>\n

17. Which nuclear reactions will generate an isotope?<\/span><\/p>\n

Neutron particle emission will generate an isotope.<\/p>\n

\u00a018. <\/span>Polymer formation from monomers starts by?<\/p>\n

Polymerisation begins with monomer addition or condensation processes.<\/p>\n

17. Bakelite is obtained from phenol by reacting with which chemical?<\/span><\/p>\n

Bakelite is obtained from phenol by reacting with formaldehyde HCHO.<\/p>\n

\u00a018. <\/span>Which chemical is classified as a condensation polymer?<\/p>\n

Dacron is a condensation polymer. Teflon, neoprene, and acrylonitrile are additional polymers.<\/p>\n

\u00a019. <\/span>What type of polymer is used to produce paints and lacquers?<\/p>\n

Glyptal is a substance used in the production of paints and lacquers.<\/p>\n

\u00a020. <\/span>Which species can best serve as an initiator for cationic polymerization?<\/p>\n

AlCl3 can serve as an initiator for cationic polymerization.<\/p>\n

\u00a021. <\/span>What are Nylon threads made of?<\/p>\n

Nylon is a polyamide. It is made from reacting carbon-based chemicals found in coal and petroleum in a high-pressure, heated environment.<\/p>\n

Also Read:<\/strong><\/p>\n

JEE Main 2022: How to Prepare for Chemistry Section?<\/a><\/p>\n

How Should You Prepare Chemistry for JEE Main?<\/a><\/p>\n

JEE 2022 Main Chemistry Chapter-wise Important Questions<\/a><\/p>\n

\u00a022. <\/span>Formation of Bakelite is followed by?<\/p>\n

The formation of Bakelite follows electrophilic substitution followed by condensation.<\/p>\n

\u00a023. <\/span>What are the two monomers for the synthesis of Nylon 6,6?<\/p>\n

Monomers of Nylon 6,6 are adipic acid and hexamethylenediamine.<\/p>\n

\u00a024. <\/span>What is the Copper wire test for halogens known as?<\/p>\n

The copper wire test for halogens is known as Beilstein’s Test.<\/p>\n

\u00a025. <\/span>Which of the following elements is estimated using the Beilstein test?<\/p>\n

The Beilstein test is a chemical test used to identify organic halides. Cl belongs to the halogen group.<\/p>\n

\u00a026. <\/span>Which of the salts is the most basic in an aqueous solution?<\/p>\n

CH3COOK + H2O \u2192 CH3COOH + KOH. KOH is a strong base, and CH3COOH is a weak acid. So the solution is essential.<\/p>\n

\u00a027. <\/span>Fire extinguishers contain H2SO4, and which one other element?<\/p>\n

Fire extinguishers contain H2SO4 and NaHCO3.<\/p>\n

28. When heated with concentrated sulphuric acid and a soluble chloride, potassium dichromate gives brown-red vapours of which element?<\/span><\/p>\n

When potassium dichromate is heated with concentrated H2SO4 and a soluble chloride, brownish-red vapours of chromyl chloride are formed.<\/p>\n

29. How many electrons are involved in the below redox reaction?<\/span><\/p>\n

Cr<\/span>2<\/span>O<\/span>7<\/span>2-<\/span> + Fe<\/span>2+<\/span> + C<\/span>2<\/span>O<\/span>4<\/span>2-<\/span> \u2192 Cr<\/span>3+<\/span> + Fe<\/span>3+<\/span> + CO<\/span>2<\/span> (unbalanced)<\/span><\/p>\n

Cr<\/span>2<\/span>O<\/span>7<\/span>2-<\/span> + 2Fe<\/span>2+<\/span> + 2C<\/span>2<\/span>O<\/span>4<\/span>2-<\/span> \u2192 2Cr<\/span>3+<\/span> + 2Fe<\/span>3+<\/span> + 4CO<\/span>2<\/span><\/p>\n

6 electrons are involved in this reaction.<\/p>\n

30. Copper turns into green when exposed to moist air for an extended period. What is the reason behind it?<\/span><\/p>\n

The copper metal turns green in colour when exposed to air because of corrosion. The metal reacts with moisture and atmospheric gases to form a copper carbonate and copper hydroxide mixture.<\/p>\n

Watch our visual story on JEE Main Exam Prep: Important Chemistry Chapters you Should not Skip<\/strong><\/p>\n

JEE Main Exam Prep: Important Chemistry Chapters you Should not Skip<\/a><\/p><\/blockquote>\n