(a) B (b) N (c) Al (d) P After the loss of first electron, the electronic configuration of (a) N3- (b) Mg2+ (c) Al3+ (d)all of the above Mg+ = 1s2 2s2 2p6 3s1 NCERT Solutions for Class 11 Chemistry in PDF format for CBSE Board as well as UP Board updated for new academic year 2020-2021 onward are available to download free along with Offline Apps based on new Syllabus. Answer: In a period, the non-metallic character increases from left to right. Which one of the following is isoelectronic with Ne? Name the groups whose elements are called representative elements. Academic team of entrancei prepared chemistry formulas based on important chapters of chemistry from class 11 and 12 .We have prepared chapter wise chemistry formulas which includes chapters from physical, Inorganic and organic chemistry. Answer: (a) The element V has highest first ionization enthalpy (∆ iH1) and positive electron gain enthalpy (∆egH) and hence it is the least reactive element. Q.1. It lies in fourth period and III B group. Sixth period contains 32 elements namely 55Cs to 86Rn and is the longest period. Discuss the main features of long form of the periodic table. The chemical formula of a compound is a symbolic representation of its chemical composition. (ii)There are groups numbered from 1 to 18 from the left. This is because after losing an electron, sodium attains the stable noble gas configuration. What are its units? 12. 19. O– (g) + e– —> O 2- (g) (∆ eg H = + 780 kJ mol -1) Justify your answer. O8 =1s2 2s2 2px1 2py1 2pz1 The key take-aways of this chapter are: Chemical bond - why do atoms combine and modes of their chemical composition. Element’s name = K (potassium) Question 30. Basics of chemistry is must to understand class 11 and 12th chemistry. electrons. It is not possible to express these when the atoms are in the ; liquid or solid state due to the presence of inter atomic forces. Question 6. Since the ionization enthalpy decreases down the group therefore, the reactivity of group 1 elements increases in the same order Li < Na < K < Rb < Cs. Electronic configuration.=1s2 2s2 2p6 3s2 3p6 3d2 4s2, and the element name is Titanium (Ti). Question 8. However, within a group, the metallic character, increases from top to bottom. (b) Element belonging to alkaline earth family (group 2) e.g., magnesium. First electron in both cases has to be removed from 3s-orbital but the nuclear charge of Na (+ 11) is lower than that of Mg (+ 12) therefore first ionization energy of sodium is lower than that of magnesium. Discuss the factors that influence the magnitude of ionization enthalpy. Show by a chemical reaction with water that Na20 is a basic oxide and Cl207 is an acidic oxide. Explain. (c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell. Answer: Statement (b) is incorrect. (i)Mg or Ca (ii) S or Cl Write the general electronic configuration of s. reacts with water to form perchloric acid which turns blue litmus red. (i)There are in all 18 vertical columns i.e. 21. Discuss the factors which influence the electron gain enthalpy. (c) K+ (aq) > Li+ (aq) > Na+ (aq) (d) Li+ (aq) < Na+ (aq) < K+ (aq) Name them. Name two such triads. Mensuration formulas play a vital role in preparing you for the class 8 exam as well as higher studies. Statistics Class 11 Formulas & Notes are cumulated in a systematic manner which gets rid of confusion among children regarding the course content since CBSE keeps on updating the course every year. Which important property did Mendeleev use to classify the elements in his periodic table and did he … Chapter 12 Organic Chemistry - Some Basic Principles and Techniques Q 3.2 | Page 361. Answer: Main features of long form of periodic table: Advantages of long form of periodic table: Question 2. Answer:  Isoelectronic species are those species (atoms/ions) which have same number of (iii) d-Block elements:(n – 1) d1-10 ns 0-2  where n = 4-7. ‘. Video explains importance of chemistry helpful for CBSE Class 11 Chemistry Chapter 1 Some basic concepts of chemistry with mcqs available @learnfatafat. For these reasons, the energy required to remove an electron from magnesium is more than the energy required in sodium. Name a species that tvill be iso electronic with each of the following atoms or ions. ∆ H=∆eg H Triad: Chlorine     Bromine     Iodine Chapter notes and important points, relevant formulas, diagrams and reactions are provided Consequently, the force of attraction by the nucleus for the valence shell electrons decreases and hence the ionization enthalpy decreases. 0->O– In the modem periodic table, the period indicates the value of Answer: (i) In case of Be (1s2 2s2) the outermost electron is present in 2s-orbital while in B (1s2 2s2 2p1) it is present in 2p-orbital. Ans. In a similar manner all the halogens i.e., elements of group VILA have similar other electronic configuration i.e., ns2 ns5 and hence possess similar properties. For example. (a) The p-block has six columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell. Give their general electronic configuration. Answer: Ionization Enthalpy. As the screening effect increases, the effective nuclear charge decreases. 22. CBSE 11 Chemistry ... 11.15 Important Compounds of Carbon - Silicones, Silicates, Zeolites. How do metals react in a group? CBSE Worksheets for Class 11 Chemistry can also use like assignments for Class 11 Chemistry students. On the other hand, magnesium, after losing on electron still has one electron. These include elements of group I (alkali metals), group 2 (alkaline earth metals). the tendency to lose electrons increases as we go down a group so the reactivity of metals increases down the group. Since both of them decreases down the group, the reactivity therefore decreases. If you want to accurate Chapter Wise NCERT Solutions for Class 11 Maths for your final exam preparation, just click the Chapter Wise NCERT Solutions links and Download PDFs with FREE of cost. Chapter 1 Some Basic Concepts of Chemistry Class 11 Notes; ... Maths Formulas: CBSE Sample Papers: Vedic Maths . Fourth and fifth period contains 18 elements each namely 19K to 36Kr and 37Rb to 54Xe and is a long period. (a) nuclear charge (Z) He did stick to it and classify elements into groups and periods. . NCERT Solutions For Class 11 Chemistry Chapter 2 – Structure Of Atom: Chapter Description. Which has a larger radius? Among the following elements, which has the least electron affinity? Ans. F~ ion has inert gas configuration, While the gain of one electron by Atomic mass of Na =(39+7)/2= 23 Why do elements in the same group have similar physical and chemical properties? 2.Name the two elements whose existence and properties were predicted by Mendeleev though they did not exist then. In short give the features of the seven periods. Question 28. Register online for Chemistry tuition on CoolGyan.Org to score more marks in your examination. Answer: The decrease in ∆iH1 value from B to Al is due to the bigger size of Al. (a) How does atomic radius vary in group in the periodic table? Question 2. (1) Synthetic fibres such as terylene ,nylon ,rayon which … Ans. Question 1. (a) Lithium and oxygen(b) Magnesium and nitrogen Get the chapter wise weightage for NEET, to know your most important topics for NEET in each of Biology, Chemistry & Physics. The normal oxide formed by the element on extreme left is the most basic (eg. Chemical formulae provide insight into the elements that constitute the molecules of a compound and also the ratio in which the atoms of these elements combine to form such molecules. Answer:  The ionisation enthalpy is for 1 mole atoms. value from B to Al is due to the bigger size of Al. Define the term ionization enthalpy? Answer: Al and Si. The reactivity of non – metals increases from left to right in a period whereas reactivity decreases in a group as we go down the group because the tendency to accept electrons decreases down the group. The revision notes covers all important formulas and concepts given in the chapter. (i) Be has higher  ∆iH1than B ? 20. of sodium is higher than that of magnesium. of electron shells increases and thus the atomic size increases. Na+ = 1s2 2s2 2p6 The second electron gain enthalpy is positive because energy is needed to overcome the force of repulsion between monovalent anion and second incoming electron. p-block —ns2 np1- 6 Question 31. The Ionic radii can be estimated by measuring the distances between cations and anions in ionic crystals. Answer: In a multielectron atom, the electrons present in the inner shells shield the electrons in the valence shell from the attraction of the nucleus or they act as a screen between the nucleus and these electrons.  (n – 2) f1-14 (n – 1) d0-11 ns2. Ans.The tendency of an element to lose electrons decreases in going from left to right in a period. 17. Ans.The German Chemist, Johann Dobereiner in early 1829 was the first to consider the idea of trends among properties of element. How would you react to the statement that the electronegativity ofN on Pauling scale is 3.0 in all the nitrogen compounds? The NCERT Solutions of chemistry class 11 PDF covers the following topics. Ans- Understand chapter before revising the science formulas to learn chapter wise science formulas one must have very clear idea about the chapter. This is known as shedding effect or screening effect. Write their four important characteristics. The effective nuclear charge per electron decrease in the anion and the cloud is held less tightly by the nucleus. Assign the position of the element having outer electronic configuration, The general electronic configuration of s – block elements is ns1-2. Meritnation|Feb 18th, 2016 01:09pm. Question 11. Important formulas for CBSE Class 10 Maths Exam 2020 are provided with this article. The combining capacity of an element is known as valency. Ans. General electronic configuration is (n – 1) d1-10  ns1-2. APPEARS IN. Therefore, the correct sequence of decreasing non-metallic character is: F > N > C > B > Si, i.e., option (c) is correct. Therefore, second ionization enthalpy of sodium is higher than that of magnesium. Ans.The radius of cation is smaller than the parent atom. (b) The element II which has the least first ionization enthalpy (∆ i H1) and a low negative electron gain enthalpy (∆egH) is the most reactive metal. Revision Notes for Class 11 Biology CBSE quick revision note for class-11 Physics, Chemistry, Maths, Biology, and other subject are very helpful to revise the whole syllabus during exam days. Which of the following is arranged in order of increasing radius? Thus, Al is more metallic than B. Physics is a subject that deals with the natural world and the properties of energy and matter, etc. What are the general trends of variation of ionization enthalpy in the periodic table? What is the electronic configuration when elements are classified group wise? Thus, among B, C, N and F, non-metallic character decreases in the order: F > N > C > B. Chapter Wise Important Questions Class 11 Chemistry. Answer: Factors affecting Ionization enthalpy. All Important Article of JEE Mains and Advanced: Click Here (a) Bond length (b) Electronegativity Increase in comfort, pleasure and luxuries. (c) Element belonging to oxygen family (group 16) e.g., oxygen. Chapter 1: Some Basic Concepts of Chemistry (c) 5. Check the Maths important formulas and properties for revision at exam time. The compound A is (a ) Ethyl acetate (b) Sodium acetate (c) Sodium propionate (d) Sodium ethoxide. Answer: Horizontal rows are called periods and vertical columns are called groups. Answer:  The energy which is released by an atom in gaining an electron from outside atom or ion to form negative ion (or anion) is called electron gain enthalpy (∆egH). F ->F– There block consists of the elements lying between s and p block starting from 4th period and onwards. Whereas electronegativity refers to tendency of the atom of an element to attract shared pair of electrons towards it in a covalent bond. Which of the following species are not known? (f) The element I has low first ionization (∆ iH1) but a very high second ionization enthalpy (∆ iH2), therefore, it must be an alkali metal. CHAPTER 3 ATOMS AND MOLECULES 1.Laws of Chemical Combination Verification of “Law of Conservation of mass” A solution of sodium chloride and silver nitrate are taken separately in the two limbs of an ’H’ shaped tube. (i) IE1 of sodium is lower than that of magnesium whereas IE2 of sodium is higher than that of magnesium. 12.Na+ has higher value of ionization enthalpy than Ne, though both have same electronic configuration. 1.How did Mendeleev arrange the elements? Answer: 1. Question 13. (ii) O has lower  ∆iH1 than N and F? In contrast,Cl207 reacts with water to form perchloric acid which turns blue litmus red. For example. The vertical columns were called groups and the horizontal rows were called periods. Questions Class 11 Notes ;... Maths formulas and concepts given in the modern table. Period of the long form of periodic table: - NCERT Exemplar Problems Class PDF...: ns2 np1-6 where n = 3 thus element belong to 3rd,! 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