NCERT Solutions for Class 8 Science Chapter 4 Materials : Metals and Non-Metals in Hindi PDF Download
FAQs on NCERT Solutions for Class 8 Science Chapter 4 - In Hindi
1. Why are Aluminium foils used to wrap food items?
Aluminium foils are mainly used to wrap food because aluminium is a highly malleable metal. This means that aluminium can be beaten into thin foils. These thin aluminium foils are ideal for wrapping foods as it is known that aluminium has less reactivity. Therefore, there is no reaction between aluminium metal and food items. Hence, the food taste remains unaltered and stays fresh for a few days.
2. Why are Immersion rods for heating liquids made up of metallic substances?
Immersion rods are generally made up of metallic substances to heat certain liquids. These metals are said to be good conductors of electricity and heat. The rods made out of metal have free electrons which help in conducting electricity and heating liquids. Immersion rods need an electricity supply to get heated, which in turn helps to heat the liquids. Therefore, in order to heat liquids, immersion rods are made up of metallic substances.
3. Explain the term ‘metallurgy’.
Metallurgy can be defined as the process used for extracting a metal in its most pure form. Metals are generally mixed with compounds such as limestone, soil, rocks, and sand, which are known as minerals. These minerals are extracted through metals at a low cost and with minimum effort. These extracted minerals are known as ores. Further, these ores are purified by adding a substance known as flux. Therefore, Metallurgy deals with the purification process.
4. What is the difference between metal and non-metal?
Metals and non-metals can be differentiated based on their physical properties as well as chemical properties. In terms of their physical properties metals are said to be highly malleable and ductile. Whereas non-metals are said to be brittle. Therefore, they can break easily. In terms of their chemical properties, metals can form basic oxides while non-metal generally form acidic oxides.
5. What is the name of Chapter 4 of Science Class 8?
Chapter 4 of Science Class 8 teaches students about Metals and Non-metals. There are four sections in this chapter namely Materials Metals and Non-Metals, Physical Properties of Metals and Non-metals, Chemical Properties of Metals and Non-metals, and finally Uses of Metals and Non-metals. All these concepts can be found in NCERT Solutions for Class 8 Science Chapter 4. There are many solutions and exercises within the chapter that the students can use to prepare for their final examinations.