Question 24. Question 1. (i) 2 moles of water. Answer: Modem Periodic Law states that physical and chemical properties of the elements are a periodic function of their atomic numbers. Chemistry XI Notes for 1st Year, Mcqs, Online Mcqs, Theory & Numerical, Questions Answers, Fill In The Blanks for All Chapters - Class XI, 11th, 1st Year Chapter # 01 Introduction To Fundamental Concepts Of Chemistry Thus, among B, C, N and F, non-metallic character decreases in the order: F > N > C > B. Question 3. Just click on the chapter for which MCQs test you need. Question 30. Since the cation is formed by losing of one or more electrons. What is screening or shielding effect? (c) K+ (aq) > Li+ (aq) > Na+ (aq) (d) Li+ (aq) < Na+ (aq) < K+ (aq) Name a species that tvill be iso electronic with each of the following atoms or ions. For example, The atomic radius of sodium (Na) is 186 pm and atomic radius of sodium ion (Na. What is the name of the metal which exists in liquid state at room temperature? of sodium is higher than that of magnesium. Since 2s – electrons are more strongly attracted by the nucleus than 2p-electrons, therefore, lesser amount of energy is required to knock out a 2p-electron than a 2s – electron. Na —> Na++ e– As a result ∆iH1 of N is higher than that of O. Give four examples of species which are isoelectronic with ca2+. The values of ∆ i H1, ∆ iH2 and ∆egH match that of Li (lithium). It makes the study of elements systematic and simple. The values of ∆ i H1, ∆ iH2 and ∆egHmatch that of He. Thus the atomic radii of the element increases. Loss of an electron from an atom results in the formation of a cation. Thus element belong to 3rd period, p-block element. Question 5. Free Online MCQ Questions of Class -11 Microeconomics Chapter 3 – Consumer’s … On the other hand, magnesium, after losing on electron still has one electron. On moving down the group their reactivity increases. Therefore, it is the least reactive non-metal. Why are electron gain enthalpies of Be and Mg positive? Therefore, the force that binds the electrons with the nucleus decreases. Biology part I book completes chapters. For noble gases have positive electron gain enthalpy because energy has to be supplied to the element. Thus it gives is a logical classification. Give general electronic configuration off-block elements? Answer: The elements in a group have same valence shell electronic configuration and hence have similar physical and chemical properties. Register online for Chemistry tuition on … What are its units? Question 9. With the addition of new shells, the number of inner electron shells which shield the valence electrons increases. Question 35. Question 3. At this page you will find Multiple Choice Questions or MCQs for all Chapters of Chemistry Class 11 and 12. Free PDF Download of CBSE Maths Multiple Choice Questions for Class 7 with Answers Chapter 3 Data Handling. Their compounds are generally coloured. Question 8. Al3+ < Mg2+ < Na+ < F– < O2- < N3-. Therefore, the period indicates the value of principal quantum number. Cl207 +H20——–>2HClO4 Name different blocks of elements in the periodic table. With the increase in atomic size, the number of electron shells increase. = 0-(-1.312 x 106mol-1) He did stick to it and classify elements into groups and periods. Question 10. Contents. Answer: (i) Ca (ii) S. Question 9. If the coordinates of a point are (0, -4), then […] (f) The element I has low first ionization (∆ iH1) but a very high second ionization enthalpy (∆ iH2), therefore, it must be an alkali metal. The type of questions that will be asked from NCERT Class 11 Chemistry Chapter 3 are displayed in the below provided NCERT Exemplar Class 11 Chemistry Chapter 3. Answer: In the modern periodic table, each period begins with the filling of a new shell. Question 9. Write their four important characteristics. Question 11. Maths MCQs for Class 7 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Therefore, it appears that the element is an alkaline earth metal and hence will form binary halide of the formula MX2(where X = halogen). Variation along a period. (b) Explain Joule Thomson effect helps in liquefaction of gases? Answer: General electronic configuration of f-block elements =(n – 2) f1-14 (n -1) d0-1 ns2. (ii) p-Block elements: ns2 np1-6 where n = 2-6. Answer: Question 15. Answer: The ionisation enthalpy is for 1 mole atoms. The volume of one mole of an ideal gas at STP is 22414 cm3? (d) This also increases, the effective nuclear charge thus the value of ∆iH1 increases. A liquid has a definite volume but the shape relates to its container. Answer: s-block elements: General electronic configuration: This is because after losing an electron, sodium attains the stable noble gas configuration. N3-, O2-, F– have same No. Among the second period elements, the actual ionization enthalpies are in the order: Li M– (g) B Al Ga In Tl Which of the following oxides is neutral? We know you are looking for 1st year biology MCQs notes of Chapter 3 Enzymes in PDF to download. Question 1. However, within a group, the metallic character, increases from top to bottom. Question 39. Download Multiple Choice Questions of Class 12 Chemistry. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 11.. Answer: Factors affecting Ionization enthalpy. (c) 5. Students can solve NCERT Class 11 Business Studies Chapter 3 – Private, Public and Global Enterprises Multiple Choice Questions with Answers to know their preparation level on Success Roar Classes Website itself. ‘. Answer: (a) All of them are isoelectronic in nature and have 10 electrons each. Question 14. Question 2. neutral gaseous atom anion Gas, liquid, and solid are known as the three states of matter, but each state may exist in one or more forms. (ii) Noble gases have positive value of electron gain enthalpy. Locate the element in the periodic table. https://byjus.com/chemistry/important-questions-class-11-chemistry =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 period = 4 Block = p-Block group = 18. (a)ionization enthalpy increases for each successive electron. 20 Questions. Therefore, electron gain enthalpies of Be and Mg are positive. November 23, 2020 by Prasanna. Check the below NCERT MCQ Questions for Class 11 Chemistry Chapter 9 Hydrogen with Answers Pdf free download. Significance of ground state. Thus, option (c) is correct. As the principal quantum number for the valence shell is 4, the element is present in the 4th period. Question 3. Answer: Al and Si. (a) K+ (aq) < Na+ (aq) < Li+ (aq) (b) K+ (aq) > Na+ (aq) > Zn2+ (aq) (b) valence principal quantum number (n) Answer: It is the energy required to remove an electron from an isolated gaseous atom in its ground state. (ii) Radius of anion is more than that of the atom. Each topic has hundreds of Chemistry questions and answers multiple choice. Give their general electronic configuration. They generally form electropositive ion by losing 1 or 2 electrons, that’s why they are electro positive in nature. Since both of them decreases down the group, the reactivity therefore decreases. This is due to continuous increases in the number of electronic shells or orbit numbers in the structure of atoms of the elements down a group. Below is the list of Chemistry Chapters and you can find Chapter wise MCQs which is necessary for test preparation. Deviation of real gases is more at high pressure and low temperature, why? Diagonal relationships are shown by O (g) + e– —> O– (g) (∆ eg H = – 141 kJ mol -1) Answer: The element is chlorine (Cl) with atomic number (Z) = 17. Thus, Al is more metallic than B. This process may be represented as M (g) + ∆iH -> M+ (g) + e–(g) The increasing order of reactivity among group 1 elements is Li < Na < K < Rb < Cs whereas that of group 17 is F > Cl > Br > I. (c) the most reactive non-metal (d) the least reactive non-metal 6. This article consists of MCQ related to the topic “Consumer’s Equilibrium (Utility Analysis)”. Online MCQ test for class 9 CBSE science They are generally heavy metals having high melting and boiling points. Which one of the following factors does not affect the valence shell? Class 10; Chemistry; MCQ; CBSE Class 10, Chemistry, MCQ. p-block elements: ns2 np1- 6 where n = 2 – 6 Chemistry Topics Wise MCQs. Which of the following statements related to the modem periodic table is incorrect? Chemistry MCQs for Class 11 Chapter Wise with Answers PDF Free Download is very important for students who want to score good marks in their CBSE board examination. We can see that in case of nitrogen 2p-orbitals are exactly half filled. (a) halogens (b) alkaline earth metals Element’s name = K (potassium) What is the electronic configuration of the elements of group 14? NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. (b) Identify the element that would tend to lose two electrons. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. A cation is smaller than its parent atom because it has fomer electrons while its nuclear charge remains the same. =1s2 2s2 2p6 3s2 Which of the following correctly represents 360g of water? OUR ANDROID APP [DOWNLOAD FREE] PHYSICS 11 MCQs Chap.1 Measurment Chap.2 Vectors and equilibrium Chap.3 Force and motion Chap.4 Work and energy Chap5 Circular motion chap.6 Fluid Mechanics Chap 7 Oscillation Chap.8 Wave MCQs with solution Chap.9 Physical options Chap.10 Thermodynamics Chemistry lecture trailer CHEMISTRY 11 MCQs Chapter No. [Hint: Apply the idea of mole concept to derive the answer], Both ionisation enthalpy and I electron gain enthalpy are generally expressed with respect to the ground state ofan atom only. O– (g) + e– —> O 2- (g) (∆ eg H = + 780 kJ mol -1) group = 3 The entire NCERT textbook questions have been solved by best teachers for you. (c) The element III which has high first ionization enthalpy (∆ iH1) and a very high negative electron gain enthalpy (∆egH) is the most reactive non-metal. 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