Page 95 Question 1. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans? Answer 1 Simple diffusion is insufficient to meet the requirements of multicellular organisms like humans because multicellular organisms, are not in direct contact with the surrounding environment as they are covered by layers. Question 2. What … [Read more...] about Chapter 6 Life Process
Science
Chapter 5 Periodic Classification of Elements
Page 81 Question 1. Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out. Answer 1 Only one triad of Dobereiner’s triads exists in the columns of Newlands’ octaves. The triad formed by the elements Li, Na, and K of Dobereiner’s triads also occurred in the columns of Newlands’ octaves. Dobereiner’s … [Read more...] about Chapter 5 Periodic Classification of Elements
Chapter 4 Carbon and its Compounds
Page 61 Question 1. What would be the electron dot structure of carbon dioxide which has the formula CO2? Answer 1 Electron dot structure of CO2: Atomic number of carbon (C) = 6 Electronic configuration of carbon (C) = 2, 4 Valence electrons of carbon (C) = 4 Atomic number of oxygen (O) = 8 Electronic configuration of oxygen (O) = 2, 6 Valence electrons of … [Read more...] about Chapter 4 Carbon and its Compounds
Chapter 3 Metals and Non Metals
Page 40 Question 1. Give an example of a metal which (i) is a liquid at room temperature. (ii) can be easily cut with a knife. (iii) is the best conductor of heat. (iv) is a poor conductor of heat. Answer 1 (i) Metal that exists in liquid state at room temperature → Mercury. (ii) Metal that can be easily cut with a knife → Sodium, Potassium. (iii) Metal that is … [Read more...] about Chapter 3 Metals and Non Metals
Chapter 2 Acids, Bases and Salts
NCERT Solutions for Chapter 1 Chemical Reactions and Equations from Class 10 Page 18 Question 1. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube? Answer 1 Let us … [Read more...] about Chapter 2 Acids, Bases and Salts