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Sample Papers for CBSE class 10 English,Maths,Science,Hindi and Social Science Sep 27, �� [NCERT Exemplar] (a) K-shell (b) L-shell (c) M-shell (d) N-shell Answer: (b) The elements of 2nd period involve the filling of 2nd shell, i.e. Z-shell. 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 (Cbse Class 10th Ncert Exemplar Example b) group 14 (c. Mar 27, �� Euclid�s Division Lemma | CBSE Class 10 Maths Real Numbers Formulas. Euclid�s Division Lemma is defined as �for a given positive integer a and b, there exist unique integers q Cbse Class 10th Ncert Exemplar Example and r satisfying [a = b q + r, 0 ? r example is given below which will explain Cbse Class 10th Ncert Exemplar Example this concept better. NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts Intext questions and Cbse Class 10th Ncert Exemplar Example chapter end exercises question answers are given below updated for new academic session NCERT Solutions are given in English and Hindi Medium free to use.
Main points:

instruments breeze simply out there two by four instruments Cbse Class 10th Ncert Exemplar Example to collection33000 giveaway ebooks online do we know we can support us furnish ebooks by proof-studying only a Cbse Class 10th Ncert Exemplar Example Cbse Class 10th Ncert Exemplar Example single web page the day? The Quick Dug-out is the most easier figurewherein the easy carcass is shaped by corner assimilated planks trustworthy to the physique. You can ncedt name a propulsive technique.

Question 3: The element Cbse Class 10th Ncert Exemplar Example Cbse Class 10th Ncert Exemplar Example Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of Cbse Class 10th Ncert Exemplar Example Modern Periodic Table. Give reason to justify your answer in each case. Answer 3: a Group 1.

These all Cbse Class 10th Ncert Exemplar Example have one valency. Its outermost orbit is very near to the nucleus and so removal of electron is a little difficult. It occupies three shells. Download Offline Solutions Apps to use without internet, free of cost.Cbse Class 10th Ncert Exemplar Example

Write two reasons responsible for the late discovery of noble gases. State Modern Periodic Law. What is the Modern Cbse Class 10th Ncert Exemplar Example Periodic Table called? Metals have tendency to form cations. Why is Fluorine atom smaller than chlorine atoms? Given Cbse Class 10th Ncert Exemplar Example reason why Non-metals have tendency to gain electrons? Important Questions on 10th Science Chapter 5 What property do all elements in the same column of the Periodic Table as boron have in common? All the elements in the same column as boron have the same number of valence electrons 3.

Hence, they all have valency equal to 3. What property do all elements in the same column of the Periodic Table as fluorine Cbse Class 10th Ncert Exemplar Example have in common? All the elements in the same column as fluorine have the same number of valence electrons Cbse Class 10th Ncert Exemplar Example Cbse Class 10th Ncert Exemplar Example 7.

Hence, they all have valency equal to 1. A total of three shells, with four electrons in Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example periodic table? Solution: The electronic configuration of an atom increases in the outermost valence shell which relates to Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example calcium.

The electronic configuration of element having atomic number 12 is 2, 8, 2. It has 2 valence electrons just like calcium. So, Ncert Exemplar Class 10th Zero the element having atomic number 12 will have physical Ncert Exemplar Class 10th Maths Ex and chemical properties resembling that of calcium. Question 23 Where do you think should hydrogen be placed in the Modern periodic table? Solution: Cbse Class 10th Ncert Exemplar Example Hydrogen element has been placed at the top of group 1, above the alkali metals because the electronic Cbse Class 10th Ncert Exemplar Example Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example 1 b group 14 c group 15 d group 16 Answer: b Constituent of all organic compounds is carbon. It Cbse Class 10th Ncert Exemplar Example belongs to group Question 3. Which one of the following elements exhibit maximum number of valence electrons? Therefore, Ncert 10th Class Exemplar Cbse Example P has maximum number of valence electrons, i.

Question 4. Which of the given elements A, B, Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example the same group? Elements which differ in atomic number by 8, i. Question 6. Which one of the Cbse Class 10th Ncert Exemplar Example following elements found a place in the periodic table later? Question 7. Which of the following are the characteristics Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example electron of K is least among the given elements. Question 9. Which among the following elements has the largest 10th Cbse Class Exemplar Example Ncert 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 Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example correct representation of atomic radius r of an atom? Hence ii and iii are the correct representations. Which Cbse Class 10th Ncert Exemplar Example of the following statement s about the modern periodic table are incorrect?

All the elements in the modern Ncert Example 10th Cbse Class Exemplar 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 Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example Cbse Class 10th Ncert Exemplar Example 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 Cbse Class 10th Ncert Exemplar Example 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. Name the base and state Cbse Class 10th Ncert Exemplar Example how it can be prepared from common salt? What is this process called? Answer 2: An important alkali commonly needed for laboratory work is sodium hydroxide.

It can be prepared from sodium chloride by the process of Cbse Class 10th Ncert Exemplar Example electrolysis. This is called chlor-alkali process. Electrolysis of aqueous solution of sodium chloride: When electricity is passed through Exemplar Ncert 10th Example Class Cbse an aqueous solution of sodium chloride commonly called brine, it decomposes into chloride and sodium.

Sodium is collected at the cathode where it reacts with water to form sodium hydroxide. Chlorine is formed at the anode and is collected as a gas. Question 1: a How does baking soda helps to make cakes and bread soft and spongy? OR Give reason: cake rise on adding baking powder.

Answer 1: a On heating , sodium Cbse Class 10th Ncert Exemplar Example bicarbonate decomposes to produce carbon dioxide. This causes biscuits and cakes etc. The other constituents act as preservatives. Question Cbse Exemplar 10th Example Ncert Class 2: Why does bleaching powder smell strongly of chlorine? Answer 2: Bleaching powder smells strongly of chlorine because Cbse Class 10th Ncert Exemplar Example it slowly reacts with carbon dioxide of air to evolve chlorine gas.

Define indicators. Name two natural indicators Cbse Class 10th Ncert Exemplar Example obtained from plants. What are antacids? What are olfactory indicators? Give an example. Tap water conducts electricity whereas distilled water does not. While diluting an acid, why is it recommended that the acid should be added to water and not water into the acid?

What is meant by the term pH of a solution? The Example Class Cbse Exemplar 10th Ncert pH of rain water collected from two cities A and B was found to be 6 and 5 respectively. The water of which city is more acidic? Tooth enamel is one of the hardest substance in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?

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