NCERT Solutions

Question 5.1: What will be the minimum pressure required to compress 500 dm3 of air at 1 bar to 200 dm3 at 30°C? Answer: Given, Initial pressure, p1 = 1 bar Initial volume, V1 = 500 dm3 Final volume, V2 = 200 dm3 Since the temperature remains constant, the final pressure (p2) can be calculated using Boyle’s law. According to Boyle’s law, Therefore, …

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Question 4.1: Explain the formation of a chemical bond. Answer: A chemical bond is defined as an attractive force that holds the constituents (atoms, ions etc.) together in a chemical species. Various theories have been suggested for the formation of chemical bonds such as the electronic theory, valence shell electron pair repulsion theory, valence bond …

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Question 3.1: What is the basic theme of organisation in the periodic table? Answer: The basic theme of organisation of elements in the periodic table is to classify the elements in periods and groups according to their properties. This arrangement makes the study of elements and their compounds simple and systematic. In the periodic table, …

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Question 2.1: (i) Calculate the number of electrons which will together weigh one gram. (ii) Calculate the mass and charge of one mole of electrons. Answer: (i) Mass of one electron = 9.10939 × 10–31 kg Number of electrons that weigh 9.10939 × 10–31 kg = 1 Number of electrons that will weigh 1 g = (1 …

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Question 1.1: Calculate the molecular mass of the following: (i) H2O (ii) CO2 (iii) CH4 Answer: (i) H2O: The molecular mass of water, H2O = (2 × Atomic mass of hydrogen) + (1 × Atomic mass of oxygen) = [2(1.0084) + 1(16.00 u)] = 2.016 u + 16.00 u = 18.016 = 18.02 u (ii) CO2: The molecular …

NCERT Solutions for Class 11 Chemistry: Chapter 1 – Some Basic Concepts of Chemistry Read More »

NCERT Class 11 Biology Chapter 22 – Chemical Coordination and Integration 1. Define the following: (a) Exocrine gland (b) Endocrine gland (c) Hormone Solution: Exocrine gland – these are the glands that liberate their secretions into ducts conveying either on the surface of the body or to particular organs of the body Endocrine gland – …

NCERT Solutions for Class 11 Biology Chapter 22 – Chemical Coordination and Integration Read More »

NCERT Cass 11 Biology Chapter 21 – Neural Control and Coordination 1. Briefly describe the structure of the following: (a) Brain (b) Eye (c) Ear Solution: The structure is as follows: a) Structure of the brain The brain is the central information processing organ of the body acting as the ‘command and control system’. It …

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NCERT Class 11 Biology Chapter 20 – Locomotion and Movement 1. Draw the diagram of a sarcomere of skeletal muscle showing different regions. Solution: The figure below represents the sarcomere of skeletal muscle showing different regions: 2. Define sliding filament theory of muscle contraction. Solution: Sliding filament theory can be defined as a theory which …

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NCERT Class 11 Biology Chapter 19 – Excretory Products and Their Elimination 1. Define Glomerular Filtration Rate (GFR) Solution: Glomerular Filtration rate (GFR) is the amount of filtrate formed by both the kidneys (nephrons) every minute. The GFR of a healthy person is approximately 125ml per minute. The GRF consists majorly of water and other …

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NCERT Class 11 Biology Chapter 18 – Body Fluids and Circulation 1. Name the components of the formed elements in the blood and mention one major function of each of them. Solution: The components of the formed elements in blood are as follows: Erythrocytes or Red blood cells – They carry oxygen and contain the …

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