Class 8 | Science | Ch 4 | Materials : Metals and Non Metals | NCERT Solutions 1.Which of the following can be beaten into thin sheets? (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen Answer: (a) Zinc 2. Which of the following statements is correct? (a) All metals are ductile. (b) All non-metals are ductile. (c) Generally, metals are ductile. (d) Some non-metals are … [Read more...] about Chapter 4 Materials : Metals and Non Metals
metals
Classification of Matter
Matter Matter is defined as anything that occupies space and possesses mass. Classification of Matter (1) Physical classification (a) Solid (b) Liquid (c) Gases Solid Liquid Gases (1) They have fixed shape and volume They do not have fixed shape but have fixed volume They do not have fixed shape and volume (2) They cannot be compressed They … [Read more...] about Classification of Matter
Metals
Question 1 Name one metal which has a low melting point? Question 2 Name two metals which are malleable and ductile? Question 3 Name one soft metal that can be cut with knife? Question 4 Name the metal which is the poorest conductor of heat? Question 5 Why copper and aluminium metals are used for making electric wires? Question 6 Why copper and aluminium metals … [Read more...] about Metals
Occurrence of Metals-concentration of ore
Question 1 Why most of the metals do not occur as free elements? Question 2 What are minerals? Question 3 Define the term ore? Question 4 Define the term metallurgy? Question 5 Define the term extraction? Question 6 Name the three steps of metallurgy? Question 7 What is gangue? Question 8 What do you mean by concentration of ore? Occurrence of Metals Most … [Read more...] about Occurrence of Metals-concentration of ore
Covalent Bond
Question 1 Define covalent bond? Question 2 Why non-metals form covalent bond? Question 3 What is a single covalent bond. Give example? Question 4 What is a double covalent bond. Give example? Question 5 What is a triple covalent bond. Give example? Question 6 Give few properties of covalent compounds? Covalent bond The chemical bond formed by sharing of … [Read more...] about Covalent Bond