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? NCERT Solutions for Class 10 Science @UrbanPro NCERT Class 8 Science Book covers a wide range of topics including several important concepts elaborated in class 9th and 10th as well. The creativity of content gives an important impression of the subject in the mind of students. Friction, sound, Force, Pressure, light, Cell structure, reproduction, microorganisms, combustion, etc are some of the important chapters. Students are taught through NCERT books. As the chapter comes to an end, students are asked few questions in an exercise to evaluate their understanding of the chapter. Free solved CBSE Sample Papers are provided by Extramarks for students to prepare for Board and academic exam. From the following table, students can find NCERT Solutions for class 11 Maths, Physics, Chemistry, English Commerce, Business Studies, Computer Science etc., Solving NCERT Solutions for class 11 will help you to solve the NCERT Class 12 questions. NCERT Solutions for class 11 is provided by the best teachers in order to help students of class.
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Three elements with filled outermost shell are: 1. Argon 2. Helium 3. Question 11 a. Lithium, sodium, potassium are metals that react with water to liberate hydrogen.

Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common Solution: a. These elements are alkali metals and they have 1 valence electron in their outermost shell and are therefore very unstable and reactive.

These elements each have full outermost subshell, which results in high stability. They only react with other elements in extreme circumstances, the trait for which they are named. Question 12 In the Modern periodic table, which are the metals among the first ten elements? Solution: The metals are Lithium and Beryllium. Question 13 By considering their position in the periodic table, which one of the following elements would you expect to have maximum metallic characteristic?

Question 14 Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table? Question 15 Element X forms a chloride with the formula XCl 2 , which is a solid with a high melting point. X would most likely be in the same group of the periodic table as a. Si Solution: b. Question 16 Which element has? Two shells, both of which are completely filled with electrons?

The electronic configuration of 2,8,2? A total of three shells, with four electrons in its valence shell? A total of two shells, with three electrons in its valence shell? Twice as many electrons in its second shell, as in its first shell? Neon 2,8 b. Magnesium 2,8,2 c. Silicon 2,8,4 d. Boron 2,3 e. Carbon 2,4. Question 17 What property do all elements in the same column of the periodic table as fluorine have in common?

Solution: These elements all have 7 electrons in their outermost shells and these often exist as salts, combined with elements from the Alkali metal group.

Question 18 An atom has electronic configuration 2,8,7. What is the atomic number of this element? Question 19 Which type of ion, cation or anion, will be formed by element A? Anion will be formed by element A. Question 20 Nitrogen atomic number 7 and phosphorus atomic number 15 belong to group 15 of the periodic Table. Solution: Electronic configuration � Nitrogen � 2s 2 2p 3 and Phosphorus � 1s 2 2s 2 2p 6 3s 2 3p 3.

Nitrogen will be more electronegative; this is because its atom has small size due to which the attraction of its nucleus for the incoming electron is more. Question 21 How does the electronic configuration of an atom relate to its position in the Modern periodic table? Solution: The electronic configuration of an atom increases in the outermost valence shell which relates to its position in the Modern periodic table.

Question 22 In the Modern periodic table, calcium atomic number 20 is surrounded by elements with atomic numbers 12, 19, 21 and Solution: The atomic number of calcium is 20, so its electronic configuration is 2, 8, 8, 2. Thus, calcium has 2 valence electrons in its outermost shell. Now, the element which has 2 valence electrons, will have physical and chemical properties resembling to that of calcium. The electronic configuration of element having atomic number 12 is 2, 8, 2.

It has 2 valence electrons just like calcium. So, the element having atomic number 12 will have physical and chemical properties resembling that of calcium. Question 23 Where do you think should hydrogen be placed in the Modern periodic table? Solution: Hydrogen element has been placed at the top of group 1, above the alkali metals because the electronic configuration of hydrogen is similar to those of alkali metals. Question 1. Which of the following is the outermost shell for elements of 2nd period?

Because in period 2, there are two shell, K and L. Question 2. An element which is an essential constituent of all organic compounds belongs to [NCERT Exemplar] a group 1 b group 14 c group 15 d group 16 Answer: b Constituent of all organic compounds is carbon. It belongs to group Question 3. Which one of the following elements exhibit maximum number of valence electrons? Therefore, P has maximum number of valence electrons, i. Question 4. Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?

Since, 2nd period has elements having atomic number 3 to Question 5. Which pair of elements belong to the same group? Elements which differ in atomic number by 8, i. Question 6. Which one of the following elements found a place in the periodic table later? Question 7. Which of the following are the characteristics of isotopes of an element? Question 8. Which of the following elements would lose an electron easily?

But out of K and Na, K will lose electron more easily because the force of, attraction on valence electron of K is least among the given elements. Question 9. Which among the following elements has the largest atomic radii?

Na and K are in the same group and K is below Na, so K will have higher atomic radius, i. In a period on moving left to right, atomic radius decreases. Since, K and Ca are in the same period and K is in 1st group and Ca is in 2nd group, so atomic radius of K will be more than Ca, i.

Also Na and Mg are in the same period, but Na belongs to 1st group and Mg belongs to 2nd group, so atomic radius of Na is more than Mg, i. Hence, we can say that the atomic radius of K is largest. Question Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic table?

With the increase of nudear charge, the force binding the electron increases so the atom lose the electrons with more difficulty, not easily. Which one of the following depicts the correct representation of atomic radius r of an atom? Hence ii and iii are the correct representations. Which of the following statement s about the modern periodic table are incorrect? All the elements in the modern periodic table are arranged on the basis of their increasing atomic number. All the isotopes can be placed at one place in the same group of the periodic table.

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong? So, it is a non-metal. Non-metal forms acidic oxide and by sharing of electrons with halogen, it forms covalent halide. Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al.

Metallic character decreases from left to right in a period. On moving in a i period from left to right, the metallic character decreases. Which of the following set of elements is written in order of their increasing metallic character? Which one of the following does not increase while moving down the group of the periodic table? The elements X, Y and Z are shown in a portion of periodic table. What would be the representations of ionic forms of X and Z respectively?

Non-metals have 4 to 8 electrons in the outermost shell. The electronic configuration of given elements are a i. Rest three elements with atomic- numbers, 3 Li , 12 Mg and 19 K are metals and hence, form basic oxides. Hence, it forms an oxide having molecular formula E 2 O 3. In other options, valency of E is not 3.

The diagram given below shows the position of elements in a portion of the periodic table. Ionic compound is formed between ���. Hence, both of these will form ionic compound, more readily than the other given elements. Element X forms a chloride with formula, XCl 2 , which is a solid with a high melting point. The element having valency 2 will be present in group 2. Out of the given choices magnesium Mg belongs to group 2. Identify the heavy metal which belongs to same group as the element discussed above.

Arrange the elements, represented by alphabets p, q, r, s and t in the above shown outline of periodic table, in increasing order of their valency.

The diagram given above represents outline of the periodic table. The alphabets p, q, r, s and t represent elements. Which one of the following pairs of alphabets represents elements which consists of same number of shells in their atom? Modern Periodic Table In , Henry Moseley showed that atomic number of an element is a more fundamental property than its atomic mass. Elements are placed in groups according to the number of valence electrons and placed in periods according to the number of shells present in them.

Helium has valence electrons equal to 2, but it is placed in group number 18 because it is a noble gas and has completely filled outermost shell. X would most likely to be in the same group of the periodic table as a Na b Mg c Al d Si Answer: b Mg Question 3 Which element has a two shells, both of which are completely filled with electrons? Answer: a Neon 2, 8 b Magnesium c Silicon 2, 8, 4 d Boron 2, Ncert Solutions For Class 10th Science Chapter 12 Visio 3 e Carbon 2, 4 Question 4 a What property do all elements in the same column of the Periodic Table as boron have in common?

Ga, Ge, As, Se, Be Solution: Beryllium Question 14 Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table?

Mg Question 16 Which element has? Carbon 2,4 Question 17 What property do all elements in the same column of the periodic table as fluorine have in common? Anion will be formed by element A Question 20 Nitrogen atomic number 7 and phosphorus atomic number 15 belong to group 15 of the periodic Table.

Because in period 2, there are two shell, K and L Question 2. For e. In the triad of Fe, Co, Ni, all the three elements have a nearly equal atomic mass and thus it does not follow the above law.

This chapter explains what a quadratic equation is and the methods of solving quadratic equations. It also explains the factorization method of solving quadratic equations and the square method.

The chapter gives the details of relationships between discriminant and nature of roots. Also, the problems of real life have been solved as examples in this chapter. Exercise 4. This chapter introduces a new topic to the students - Arithmetic Progression, commonly called as AP.

Students will learn what is AP, derivation of nth term, finding the sum of first n terms of the AP and solving the real life problems using AP in this chapter.

The first Exercise of the chapter teaches how to represent a problem or situation in the form of AP, how to find the first term and difference of the AP, and to find whether the given series is Ap or not. The next Exercise, Ex 5. The third Exercise describes how to find the sum of first n terms of AP and contains questions related to the topic. The last and fourth Exercise have questions related to the topics taught in the chapter.

Exercise 5. The chapter 6 of class 10 gives details about the triangles. The chapter gives details about the figures with the same shape but different sizes. It explains the similarity of the triangles, theorems associated with the similarity of triangles and the concept of congruent triangles. Further, theorems related to areas of triangles, the Pythagoras theorem and the converse of pythagoras theorem is explained.

Exercise 6. Class 10 Maths Chapter 7 explains coordinate geometry, the maths of locating a given point with the help of an ordered pair of numbers. The coordinate or cartesian geometry helps to find the distance between two points whose coordinates are given. The concept of finding the area of a triangle formed by three given points. Also, the ways of finding the coordinates of the point which divides a line segment joining two given points in a given ratio is explained in the chapter.

Exercise 7. Trigonometry is the study of the ratio of right triangles with respect to the acute angles, which are known as trigonometric ratios of the angles. Students will also learn to calculate trigonometric ratios for the given angles and also a few trigonometric identities. Exercise 8. Chapter 9 is the continuation of chapter 8 where the students will learn about the application of trigonometry which they learnt in the previous chapter.

This chapter helps to understand how trigonometry is applied to our everyday life to find out the height and distance of various objects. They will also learn how trigonometry is applied and used in navigation, construction and determining the position of any piece of land based on their latitude and longitudes. Exercise 9. In this chapter, students will be introduced to the concept of tangents and number of tangents from a point on a circle.

Exercise Chapter 11 is one of the interesting chapters. This chapter is all about constructing various geometric figures. The students will learn to divide a line segment, and how to draw tangents to a circle. The methods of construction are well explained in the chapter to clear the concepts.

As the name suggests, the chapter is about the perimeter and area of a circle. The concepts of finding the area of a sector and segment of a circle is clarified here. This chapter further explains how to find the area of the figures that contains a circle or part of a circle. In the five Exercises of this chapter, finding the surface area of any object which is made up of two or more different solid shapes.

The solid shapes include cuboid, cone, sphere, hemisphere and cylinder. Then, there are questions on finding the volume of the objects that are again made up of two different solid shapes. Also, there are questions which ask about the conversion from one shape to another.

This chapter further explains how to find the volume, curved surface area and total surface area of a frustum of a cone. This is another interesting chapter where the students learn about the numerical representation of data, grouped or ungrouped. They further learn about finding the mean, median and mode of the given data. In the next Exercise, they will learn about the cumulative frequency distribution and drawing cumulative frequency curves.

It elaborates and explains the difference between experimental probability and theoretical probability. The chapter is full of examples to clear the concept of probability to the learners. Students can download the PDF easily and start going through the chapters. You will find Ncert Solutions For Class 10th Science Chapter 6 Series clear categorisation and step by step solutions of all the questions with a clear conclusion. This will help you to understand how you can write answers in your exams to help you score well.

The exam is of marks where 80 marks is for theory whereas 20 marks is given for internal assessment. To Ncert Solution Of 10th Class Science Service understand the marking scheme in a better way, you should understand the exam pattern clearly. To score good in the exam, you should know how much mark is awarded for each question and each step of the question. Every year, just before the board exams, the board releases sample papers and marking schemes so that all the doubts of the students are cleared.

The number of questions are increased and the marks per question are reduced. This marking scheme will be helpful to the students as the maximum number of questions will become objective or very short answer type as the marks per question has reduced.

CBSE focuses on all-round development of Class 10 students to prepare them for their further education. To perform well in Class 10 then becomes fairly important.

CBSE marking scheme is stepwise so you have scored accordingly. Therefore students should write each step clearly and give a proper conclusion at the end of the answer. The unit wise marks weightage of the mathematics paper is as follows:. The paper has four sections. There are a total of 30 questions for 80 marks. Number System. Coordinate geometry. Statistics and probability.

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