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NCERT Solutions for Class 10 Maths PDF Updated for Session

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 boat excursions tulum 10 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 10th Class Ka Ncert Book Guideline 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 of 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 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 can be profitably and economically extracted, then it 10th Ncert Guide Journal is called an ore.

Question 1: Atmospheric air always contains moisture. Then, how can you protect iron articles 10th ncert guide 61 the affect of atmosphere? Answer boat excursions tulum 10 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 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 10th ncert guide 61 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, 10th ncert guide 61 will reacts slowly with other substances.

Such a metal will be less reactive. For example, sodium atom is 10th ncert guide 61 very reactive metals because it readily loses 10th Class Hindi Ncert Guide Number 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 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 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 10th Class Science Ncert Guide Sale 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 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 10th ncert guide 61 contact with iron.

Platinum, boat excursions tulum 10 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 make 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 boat excursions tulum 10 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 boat excursions tulum 10 easily extracted from their oxides rather than from their carbonates and sulphides.

Chapter 4: Carbon and its Compounds �.

On the other hand, the World Bank uses per capita income as the only criterion for measuring development and classifying the countries as rich and poor. In the second Exercise, the students need to find a quadratic polynomial. To make it easier for you to study, we cover chapter-wise solutions with step-wise answers for the questions present in the recent NCERT Chemistry textbooks. This chapter further explains how to find the volume, curved surface area and total surface area of a frustum of a cone. If you can grasp the concepts and topics of class 10 maths, you can definitely score very high marks in the board exams.
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