NCERT Solutions for Class 10 Science Chapter 3
1: How to prevent corrosion?
Corrosion is a natural phenomenon in which deterioration of a material is caused by some interactions in the environment. There are three conditions required for the corrosion to take place - Presence of moisture, a metallic surface, and an oxidizing agent which is also known as electron acceptor. The process of corrosion converts the reactive metal surface into the stable form of oxide, hydroxide, or sulfide. Corrosion can be prevented by applying a protective coating on the surface of the metal which acts as a physical barrier between the metal parts and oxidizing elements. Galvanization is a method in which manufacturers coat the part with a very thin layer of zinc. Cathodic Protection is the method of applying an opposing electrical current to the metal’s surface using an outside course of electrical current to overpower a corrosive current in the part. However, these measures are nothing without ongoing maintenance and monitoring as coatings can wear with time so it's important to maintain metals and keep the parts clean. and apply additional protection as necessary.
2: What are the uses of metals and non-metals?
There are vast uses of metals and nonmetals in our day to day lives. All the electronics equipment which we use like TV, mobiles, fridges etc in daily life use metals in the body for different purposes. But one of the key purposes is to facilitate electricity transfer as metals are good conductors of electricity. Metals are also used in medicines as they are needed for conduction of nerve impulses, to carry oxygen by blood, to facilitate enzyme reactions, etc. Some metals are used to cure any micronutrient metal deficiency diseases in humans and animals. Other uses of metals are in Construction industries, jewellery making, machinery, automobiles, and many more. Similarly nonmetals find its uses in medical purposes. Nonmetals are often used as a powerful disinfectant, important ingredient in many chemical solutions but we also use it as an important element in combustion in batteries and in manufacturing. Nonmetals are also used to purify drinking water and swimming pools.
3: What are the differences between metals and nonmetals according to their physical properties?
On the basis of their physical properties metals and non-metals can be distinguished in the following ways. All metals are solid at room temperature except mercury, which is a liquid at room temperature but mon-metals can exist as solid, liquid or gas. All metals are lustrous whereas non-metals are non-lustrous. Metals have high densities except for lithium, sodium and potassium and nonmetals have a low density. Metals are malleable and ductile whereas nonmetals are not. Metals are good conductors of heat and electricity and have a high melting point but nonmetals are poor conductors of heat and electricity with low melting and boiling point.
4: Why is the NCERT solution of Class 10 Chapter 3 by Vedantu is important?
NCERT Solutions for Class 10 Chemistry Chapter 3 provides the simple and to the point answers to the exercise questions which are extremely helpful in understanding how to write answers in exams. The solutions are also very effective for exam preparations because it saves a lot of time by allowing fast revision. The solutions are designed by expert teachers as per the latest CBSE exam guidelines and syllabus. Hence, these are beneficial in scoring well in the Chemistry paper.