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JEE Main Previous Year Questions (2025): Chemistry in Everyday Life
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Page 1 JEE Main Previous Year Questions (2025): Chemistry in Everyday Life Q1: Thyroxine, the hormone has given below structure The percentage of iodine in thyroxine is _ _ _ _ %. (nearest integer) (Given molar mass in ???? ?? ?? - ?? ?? : ???? . ?? : ?? , ?? : ???? , ?? : ???? , ?? : ?????? ) Ans: 65% Solution: (Thyroxine Hormone) ? Molecular formula of Thyroxine ? C 15 H 11 O 4 NI 4 ? Molecular mass of Thyroxine - C ? 15 × 12 = 180 H ? 11 × 1 = 11 O ? 16 × 4 = 64 N ? 14 × 1 = 14 I ? 127 × 4 = 508 ? Molecular mass of Thyroxine ? 777 ? % of Iodine = 508 777 × 10 0 = 65 . 38 % Nearest integer = 65%Read More
FAQs on JEE Main Previous Year Questions (2025): Chemistry in Everyday Life
| 1. What are the major classes of biomolecules involved in chemistry in everyday life? |  |
Ans. The major classes of biomolecules that play a crucial role in chemistry in everyday life include carbohydrates, proteins, lipids, and nucleic acids. Carbohydrates serve as energy sources and structural components, proteins are essential for various functions including enzymes and antibodies, lipids are important for energy storage and cellular structure, and nucleic acids (DNA and RNA) are key for genetic information and protein synthesis.
| 2. How do drugs interact with biological systems in the context of chemistry in everyday life? | |
Ans. Drugs interact with biological systems primarily through chemical interactions with specific biomolecules such as enzymes, receptors, and transport proteins. These interactions can either enhance or inhibit biological processes, leading to therapeutic effects or side effects. Understanding these interactions is critical for the design and development of effective medications.
| 3. What is the significance of antioxidants in everyday chemistry? | |
Ans. Antioxidants are substances that help prevent oxidative stress by neutralizing free radicals in the body. They play a vital role in protecting cells from damage, which can lead to chronic diseases such as cancer, cardiovascular diseases, and aging. Common antioxidants include vitamins C and E, and compounds found in fruits and vegetables.
| 4. What role do surfactants play in chemistry in everyday life? | |
Ans. Surfactants are compounds that lower the surface tension between two liquids or a liquid and a solid. They are used in a variety of everyday products, such as detergents, soaps, and emulsifiers in food. Surfactants help to improve the cleaning efficiency of products and stabilize mixtures by allowing water and oil to mix.
| 5. How do enzymes function as catalysts in biochemical reactions? | |
Ans. Enzymes are biological catalysts that accelerate chemical reactions in living organisms by lowering the activation energy required for the reaction to occur. They are highly specific, meaning each enzyme typically catalyzes a single type of reaction. Enzymes are crucial for various metabolic processes, including digestion and energy production.
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