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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. Roasting: 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 Ncert Solutions For Class 10th Science Chapter 3 Ess ionic compounds have high melting points. There are solids due Ncert Solutions For Class 10th Science Chapter 3 Ess 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 Ncert Solutions For Class 10th Science Chapter 3 Ess given composition. Metallurgy involves various processes starting with the treatment of ore to getting metals in the pure form.

Question 1: Compare Ncert Solutions For Class 10th Science Chapter 3 Ess the properties of a typical metal and non-metal on the Ess For 3 Chapter Science Solutions Ncert Class 10th 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 is 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 Ncert Solutions For Class 10th Science Chapter 3 Ess can be profitably and economically extracted, then it is called an Ncert Solutions For Class 10th Science Chapter 3 Ess ore.

Question 1: Atmospheric air always contains moisture. Then, how can you protect iron articles from the affect of atmosphere? Answer 1: Ncert Solutions For Class 10th Science Chapter 3 Ess 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 chrome plating are quite Ncert Solutions For Class 10th Science Chapter 3 Ess useful. Question ncert solutions for class 10th science chapter 3 ess 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 ncert solutions for class 10th Ncert Solutions For Class 10th Science Chapter 3 Ess science chapter 3 ess 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 metals 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 Ncert Solutions For Class 10th Science Chapter 3 Ess lead metal is less reactive. Metals that are less reactive than hydrogen do not ncert solutions for class 10th science chapter 3 ess it.

For example: copper and silver. Galvanisation: An iron article is coated with a layer of zinc metal, which prevents Ncert Solutions For Class 10th Science Chapter 3 Ess Ncert Solutions For Class 10th Science Chapter 3 Ess the iron to come 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 Ncert Solutions For Class 10th Science Chapter 3 Ess fire.

Distinguish between calcinations and roasting. Ionic compounds have high Ncert Solutions For Class 10th Science Chapter 3 Ess Ncert Solutions For Class 10th Science Chapter 3 Ess 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 Ncert Solutions For Class 10th Science Chapter 3 Ess will not. Metals that are more reactive than hydrogen displace it from dilute acids. For example: sodium and potassium.

What are the two important ways to prevent the rusting of iron? Oiling, Ncert Solutions For Class 10th Science Chapter 3 Ess greasing, or painting: By applying oil, grease, or paint, the surface becomes water proof and the moisture ncert solutions for class 10th 10th Class Ess For Ncert Science Solutions 3 Chapter science chapter 3 ess oxygen present in the air cannot come into direct contact with iron.

Platinum, gold and silver are used Ncert Solutions For Class 10th Science Chapter 3 Ess 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 Ncert Solutions For Class 10th Science Chapter 3 Ess 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 make utensils for cooking. Though aluminium is a highly reactive metal, it is Ncert Solutions For Class 10th Science 3 Of Ncert Book Class 10th Device Chapter 3 Ess resistant to corrosion.

This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide. This Solutions Class Ncert Science 10th Chapter For 3 Ess oxide layer is very stable and ncert solutions for class 10th Ncert Solutions For Class 10th Science Chapter 3 Ess Ncert Solutions For Class 10th Science Chapter 3 Ess science chapter 3 ess further reaction of aluminium with oxygen. Also, Ncert Solutions For Class 10th Science Chapter 3 EsChapter Class Ncert Science 10th Ess 3 Solutions For s it is light in weight and a good conductor of 3 Class Ncert 10th For Science Solutions Chapter Ess 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 carbonates and sulphides. Chapter Ncert Solutions For Class 10th Science Chapter 3 Ess 4: Carbon and its Compounds �.

Which service demands the creation of a 'users' profile'? Assertion A : Performance measurement is necessary to support decision making in libraries and information centres. A cycled index string consists of a keyword from the input string, the part of the input string following the keyword, a dividing symbol, and the part of the input string preceding the keyword. If no part of the input string happens to follow the keyword, as in index string 1 above, or to precede the keyword, Ncert Solutions For Class 10th Science Chapter 3 Ess as in 2, the index string will of course look somewhat simpler, since one part of it will be empty. In which year Budapest Open Access Initiatives declaration took place a b c d

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