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Aluminium and copper metals are good conductor of heat. When exposed to air, these develop a layer of oxide. This makes it resistant to further corrosion. Calcination: i The ore is heated is absence of air. Ncert solutions class 10th 3.6 ost i The ore is heated in the presence of air. In iconic compounds, ions are joined together due to powerful electrostatic forces, therefore, considerable energy is required to separate these ions and break the lattice.

Thus ionic compounds have high melting points. There are solids due to strong force of attraction between oppositely charged ions resulting in the formation of hard crystalline lattice.

An alloy is a homogeneous mixture of two or more metals, or a metals and a non-metal. It is prepared by first melting the main metal, and then dissolving the required amount of other metals or non-metals. This mixture is then cooled to form an alloy of a given composition.

Metallurgy involves various processes starting with the treatment of ore to getting metals in the pure form. Question 1: Compare the properties ncert solutions class 10th 3.6 ost a typical metal and non-metal on the basis of the following: i nature of oxide formed by them ii conductivity.

Answer : i Metals from basic oxide, e. Non-metals from acidic oxide, e. Non-metals do not conduct heat or electricity, e. Question 2: How ncert solutions class 10th 3.6 ost an ore different from a mineral? Justify the statement with examples. Answer 2: The metals found in nature in combined state are called minerals.

If some minerals contain a very high percentage of a particular metal and the metals can be profitably and economically extracted, then it is called an ore. Question 1: Atmospheric air always contains moisture. Then, how can you protect iron articles from the affect of atmosphere?

Answer 1: Iron articles can be protected from the effect of atmosphere by painting, oiling and greasing. This gives temporary protection to iron articles.

For long time protection, galvanising or Ncert Solutions Class 10th 3.6 Pdf chrome plating are quite useful. Question 2: Explain, why some metals are more reactive and others less reactive and others less reactive? OR What determines the reactivity of metals? Answer 2: When metals react, they lose electrons to form positive ions.

Such metals which can lose electrons easily to form positive ions when reacted with other substances, are reactive metals. On the other hand, if a metal loses electrons less rapidly to form positive ions, it will reacts slowly with other substances.

Such a metal will be less reactive. For example, sodium atom is a very reactive ncert solutions class 10th 3.6 ost because it readily loses one electron, forms a positive ion which then combines with other substances.

On the other hand, lead atom loses electrons with difficulty to form positive ions, so lead Ncert Solutions Class 10th 3.6 Ios metal is less reactive. Metals that are less reactive than hydrogen do not displace it. For example: copper and silver. Galvanisation: An iron article is coated with a layer of zinc metal, which prevents the iron to ncert solutions class 10th 3.6 ost in contact with oxygen and moisture.

Hence, rusting is prevented. Why are aluminium and copper metals used for making cooking vessels? Why is sodium kept immersed in kerosene oil? Sodium is very reactive. If kept exposed to air, it catches fire. Distinguish between calcinations and roasting. Ionic compounds have high melting point. Give reason in support your answer. Generally, Ionic compounds are hard crystalline solids.

What are alloys? What is meant by metallurgy? Important Questions on 10th Science Chapter 3 Name two metals which will displace hydrogen from dilute acids, and two metals which will not. Metals that are more reactive than hydrogen displace it from dilute acids.

For Ncert Solutions Class 10th Exercise 3.6 Pdf example: sodium and potassium. What are the two important ways to prevent the rusting of iron? Oiling, greasing, or painting: By applying oil, grease, or paint, the surface becomes water proof and the moisture and oxygen present in the air cannot come into direct contact with iron. Platinum, gold and silver are used to make jewellery. Platinum, gold, and silver are used to make jewellery because they are very lustrous.

Also, they are very less reactive and do not corrode easily. Why are Sodium, potassium and lithium stored under oil? Sodium, potassium, and lithium are very reactive metals and react very 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. Aluminium is a highly reactive metal, yet it is used to ncert solutions class 10th 3.6 ost utensils for cooking.

Though aluminium is a highly reactive metal, it 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. Carbonate and Sulphide ores are usually converted into oxides during the process of extraction.

Carbonate and sulphide ores are usually converted into oxides during the process of extraction because metals can be easily extracted from their oxides rather than from their ncert solutions class 10th 3.6 ost and sulphides.

Chapter 4: Carbon and its Compounds �.

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This in turn, helps you not only in exams but also helps you complete your home works and assignments on time. We have enlisted all the chapters in each subject.

Your performance in the foundation exams will play a role in determining your admission into higher classes all the way to a good college or even your dream college! If you have any query regarding this article or NCERT Sols for Class 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th and 12th, leave your comments in the comment section below and we will get back to you as soon as possible.

NCERT is also known as the publishing body or publisher. It is an autonomous organisation set up in by the Government of India, aiming to assist and advise the Central as Ncert Solutions Class 10th 3.6 Os well as the State Governments on policies and programmes for qualitative improvement in school education. The function of NCERT is to conduct and support educational research and to offer training in educational research methodology.

But then again, simply byhearting the NCERT books a few weeks before the exams is not going to help the students with anything. Once done with studying and practicing with the books, students should solve the sample papers as well as previous year question papers to get an idea of the question paper pattern.

What is the basic first class full fare and what is the reservation charge? He takes 8 hours, if he travels km by train and rest by bus. Further, it takes 20 minute longer, if he travels km by train and rest by bus. Find the speeds of the train and the bus. Ritu can row downstream 20 km in 2 hours, and upstream 4 km in 2 hours.

Find her speed of rowing in still water and the speed of the current. Find the time taken by 1 woman alone to finish the work, and also that taken by 1 man alone. Roohi travels km to her home partly by train and partly by bus. Therefore, LearnCBSE is trying to make the students prepared for all phase of the exams and get passed with flying numbers in 10th standard. Student can solve complex problems with the help of solutions, where the best and easy methods are given to explain the concepts.

Also, revision notes will help them to have a quick look on all the topics while preparing for examinations. Do Indians Get Enough Sleep? Laughter � The Best Medicine C. The World of Sports E. My struggle for an Education B. Educating the Girl Child C.

Inclusive Education D. Promise for the Future : Renewable Energy B. Pluggin into Future C. Space Travel D. Heroes of the Environment C.

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