Non-metals combine with oxygen to form acidic oxides or neutral oxides. Examples of acidic oxides are SO2, CO2 etc. and examples of neutral oxides are NO, CO etc.
Amphoteric oxides are the oxides, which react with both acids and bases to form salt and water. Examples: Zinc oxide (ZnO) and Aluminium oxide (Al2O3)
(c) Zinc is more reactive than tin which may react with food items and make it unfit for health.
(c) Applying a coating of zinc
(d) AgNO3 solution and copper metal
The solution he had used was Aqua regia which is the mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1. It is a fuming, highly corrosive liquid that is capable of dissolving metals like Gold and Platinum. Since the outer layer of the gold bangles is dissolved in aqua regia so their weight was reduced drastically.
Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. The sour substances like lemon or tamarind contain citric acid that neutralises the basis copper carbonate and dissolves the layer. That is why; tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.
The two ways by which rusting of iron can be prevented are:
1. By oiling, greasing or painting the surface becomes waterproof and the moisture and oxygen present in the air cannot come into direct contact with iron. Hence, rusting is prevented.
2. By Galvanization: In this method an iron article is coated with a layer of zinc metal, which prevents the iron from coming in contact with oxygen and moisture. Hence, rusting is prevented.
Metals that are more reactive than hydrogen displace it from dilute acids. For example, sodium and potassium displace hydrogen from dilute acids. On the other hand less reactive metals like copper, silver do not displace hydrogen from dilute acids.
1. Platinum, gold, and silver are used to make jewellery because they are very less reactive metals. Also they are lustrous and do not corrode easily.
2. Sodium, potassium, and lithium are very reactive metals. They react vigorously with air as well as water; therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture.
3. Aluminium is a highly reactive metal and is resistant to corrosion. This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide. This oxide layer is very stable and prevents further reaction of aluminium with oxygen. Also, it is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils.
4. Carbonate and sulphide ores are usually converted into oxides during the process of extraction because it is easier to obtain metals from their oxides as compared to their carbonates and sulphides.
In the electrolytic refining of a metal M:
Anode is impure, thick block of metal M
Cathode is thin strip or wire of pure metal M
Electrolyte is salt solution of metal M to be refined
1. If a substance can be beaten into thin sheets with the help of a hammer then it is a metal, whereas if it gets broken into pieces then it is non-metal. We can use the battery, bulb, wires, and a switch to set up a circuit with the sample. If the sample conducts electricity and bulbs starts to glow, then it is a metal otherwise it is a non-metal.
2. When a substance fulfills both the criteria then it can be confirmed as a metal. We know that there are some exceptions also for example sodium is metal which is not malleable in fact it is brittle. Graphite, a non-metal (allotrope of carbon) is a good conductor of electricity. Hence, either of the tests cannot confirm a metal or non-metal; when the test is done in isolation.
NCERT 10 solutions for math are in-depth solutions written in very basic and simple language which makes them easy to understand. It gives sufficient study material to practice with to the students which the latter can use for practicing for board exams. Extramarks website has NCERT solutions for all classes that can be used by students of different classes. These solutions can be accessed by visiting the footer section of the website. Prepare notes and learn from NCERT solutions, go through them thoroughly before the exam, and practice with the questions that crop up in NCERT solutions.
Yes, Extramarks website has NCERT solutions for class 10 along with all other classes of CBSE listed on the footer section. These solutions have been prepared by top faculty members who have years of experience and expertise in teaching CBSE students.
Extramarks class 10 NCERT solutions are crucial for board preparation for students. These solutions are given in a simple language which makes it easy to understand for all and it proves to be the basis for board examination which further helps the students in understanding the extensive study material. Class 10 NCERT solutions focus on fundamental clarity of the concepts which further helping in clearing all doubts and helping students achieve concept clarity. NCERT solutions provide enough practice and study material to students that they can use to test their knowledge
Yes, class 10 solutions (NCERT) are sufficient to prepare for class 10 board exams. NCERT solutions are simple and easy to understand written in a way that is appealing to students. NCERT solutions form the basis of examination of class 10 board so they prove to be a sufficient solution which also gives enough study material to practice with to students. Different types of NCERT solutions help students prepare for the exam through varied formats and provide them concept clarity.
Class 10 CBSE NCERT solutions are sufficient to prepare for board exams but if you want to test your knowledge and would like to browse more solutions then you can use textbook solutions to prepare for the exam. Although the NCERT solutions are enough for preparing for the exam, you can check out the solved and unsolved sample papers along with textbook solutions from Extramarks - The Learning App and website